Cppcheck: Fixed some issues found by Flössie during review of my changes

rtengine/FTblockDN.cc

@@ -1677,10 +1677,7 @@ SSEFUNCTION void ImProcFunctions::RGB_denoise(int kall, Imagefloat * src, Imagef
                         }
 
                         delete labdn;
-
-                        if (Lin) {
-                            delete Lin;
-                        }
+                        delete Lin;
 
                     }//end of tile row
                 }//end of tile loop

rtengine/lcp.cc

@@ -276,7 +276,7 @@ float LCPMapper::calcVignetteFac(int x, int y) const
                                                    + 2.*aVig[0] * aVig[2] - 3.*param0Sqr * aVig[1]) * rsqr * rsqr));
 }
 
-LCPProfile::LCPProfile(Glib::ustring fname)
+LCPProfile::LCPProfile(const Glib::ustring &fname)
 {
     const int BufferSize = 8192;
     char buf[BufferSize];

rtengine/lcp.h

@@ -89,7 +89,7 @@ public:
     static const int MaxPersModelCount = 3000;
     LCPPersModel* aPersModel[MaxPersModelCount];  // Do NOT use std::list or something, it's buggy in GCC!
 
-    explicit LCPProfile(Glib::ustring fname);
+    explicit LCPProfile(const Glib::ustring &fname);
 
     void calcParams(int mode, float focalLength, float focusDist, float aperture, LCPModelCommon *pCorr1, LCPModelCommon *pCorr2, LCPModelCommon *pCorr3) const;  // Interpolates between the persModels frames