Apply modernize-use-nullptr

Setup:
- `mkdir tidy; cd tidy`
- `cmake .. -DCMAKE_BUILD_TYPE=debug -DPROC_TARGET_NUMBER=1 -DCACHE_NAME_SUFFIX=4 -DBINDIR=. -DDATADIR=. -DBUILD_BUNDLE=ON -DWITH_LTO=OFF -DOPTION_OMP=OFF -DCMAKE_EXPORT_COMPILE_COMMANDS=ON`
- `cd ..`
- `find -name '*.cc' -exec clang-tidy-3.8 -header-filter=.* -p=tidy -fix-errors -checks=modernize-use-nullptr {} \;`

rtengine/dfmanager.cc

@@ -45,7 +45,7 @@ inline dfInfo& dfInfo::operator =(const dfInfo &o)
 
     if( ri ) {
         delete ri;
-        ri = NULL;
+        ri = nullptr;
     }
 
     return *this;
@@ -138,7 +138,7 @@ void dfInfo::updateRawImage()
 
         if( ri->loadRaw(true)) {
             delete ri;
-            ri = NULL;
+            ri = nullptr;
         } else {
             int H = ri->get_height();
             int W = ri->get_width();
@@ -200,7 +200,7 @@ void dfInfo::updateRawImage()
 
         if( ri->loadRaw(true)) {
             delete ri;
-            ri = NULL;
+            ri = nullptr;
         } else {
             ri->compress_image();
         }
@@ -332,11 +332,11 @@ dfInfo* DFManager::addFileInfo (const Glib::ustring& filename, bool pool)
     auto file = Gio::File::create_for_path (filename);
 
     if (!file) {
-        return 0;
+        return nullptr;
     }
 
     if (!file->query_exists ()) {
-        return 0;
+        return nullptr;
     }
 
     try {
@@ -344,11 +344,11 @@ dfInfo* DFManager::addFileInfo (const Glib::ustring& filename, bool pool)
         auto info = file->query_info ();
 
         if (!info && info->get_file_type () == Gio::FILE_TYPE_DIRECTORY) {
-            return 0;
+            return nullptr;
         }
 
         if (!options.fbShowHidden && info->is_hidden ()) {
-            return 0;
+            return nullptr;
         }
 
         Glib::ustring ext;
@@ -359,14 +359,14 @@ dfInfo* DFManager::addFileInfo (const Glib::ustring& filename, bool pool)
         }
 
         if (!options.is_extention_enabled (ext)) {
-            return 0;
+            return nullptr;
         }
 
         RawImage ri (filename);
         int res = ri.loadRaw (false); // Read informations about shot
 
         if (res != 0) {
-            return 0;
+            return nullptr;
         }
 
         dfList_t::iterator iter;
@@ -406,7 +406,7 @@ dfInfo* DFManager::addFileInfo (const Glib::ustring& filename, bool pool)
 
     } catch(Gio::Error&) {}
 
-    return 0;
+    return nullptr;
 }
 
 void DFManager::getStat( int &totFiles, int &totTemplates)
@@ -433,7 +433,7 @@ void DFManager::getStat( int &totFiles, int &totTemplates)
 dfInfo* DFManager::find( const std::string &mak, const std::string &mod, int isospeed, double shut, time_t t )
 {
     if( dfList.empty() ) {
-        return 0;
+        return nullptr;
     }
 
     std::string key( dfInfo::key(mak, mod, isospeed, shut) );
@@ -467,7 +467,7 @@ dfInfo* DFManager::find( const std::string &mak, const std::string &mod, int iso
             }
         }
 
-        return bestD != INFINITY ? &(bestMatch->second) : 0 ;
+        return bestD != INFINITY ? &(bestMatch->second) : nullptr ;
     }
 }
 
@@ -478,7 +478,7 @@ RawImage* DFManager::searchDarkFrame( const std::string &mak, const std::string
     if( df ) {
         return df->getRawImage();
     } else {
-        return 0;
+        return nullptr;
     }
 }
 
@@ -496,7 +496,7 @@ RawImage* DFManager::searchDarkFrame( const Glib::ustring filename )
         return df->getRawImage();
     }
 
-    return 0;
+    return nullptr;
 }
 std::vector<badPix> *DFManager::getHotPixels ( const Glib::ustring filename )
 {
@@ -506,7 +506,7 @@ std::vector<badPix> *DFManager::getHotPixels ( const Glib::ustring filename )
         }
     }
 
-    return 0;
+    return nullptr;
 }
 std::vector<badPix> *DFManager::getHotPixels ( const std::string &mak, const std::string &mod, int iso, double shut, time_t t )
 {
@@ -525,7 +525,7 @@ std::vector<badPix> *DFManager::getHotPixels ( const std::string &mak, const std
 
         return &df->getHotPixels();
     } else {
-        return 0;
+        return nullptr;
     }
 }
 
@@ -624,7 +624,7 @@ std::vector<badPix> *DFManager::getBadPixels ( const std::string &mak, const std
     }
 
     if(!found) {
-        return 0;
+        return nullptr;
     } else {
         return &(iter->second);
     }