A few more minor fixes geared towards lgtm.com alerts (#6127)

* Remove unfilled formatting placeholders in KLT parser.
* Fix presumably unintentionally missing reference on PlanatPtr and ChunkyPtr call operators.
* Fix catching pointer and make use-after-free of workimg easier to spot.
Make sure all of our thrown exceptions derive from std::exception and then catch
by reference instead of by pointer.
* Fix mismatch between array form new and non-array form delete.
* Simplify memory management of embedded color profiles by unifying allocation to use operator new.

rtengine/iccjpeg.cc

@@ -18,7 +18,7 @@
  */
 
 #include "iccjpeg.h"
-#include <cstdlib>          /* define malloc() */
+#include <new>
 
 
 /*
@@ -155,12 +155,9 @@ marker_is_icc (jpeg_saved_marker_ptr marker)
  * If TRUE is returned, *icc_data_ptr is set to point to the
  * returned data, and *icc_data_len is set to its length.
  *
- * IMPORTANT: the data at **icc_data_ptr has been allocated with malloc()
- * and must be freed by the caller with free() when the caller no longer
- * needs it.  (Alternatively, we could write this routine to use the
- * IJG library's memory allocator, so that the data would be freed implicitly
- * at jpeg_finish_decompress() time.  But it seems likely that many apps
- * will prefer to have the data stick around after decompression finishes.)
+ * IMPORTANT: the data at **icc_data_ptr has been allocated with new
+ * and must be freed by the caller with delete[] when the caller no longer
+ * needs it.
  *
  * NOTE: if the file contains invalid ICC APP2 markers, we just silently
  * return FALSE.  You might want to issue an error message instead.
@@ -235,7 +232,7 @@ read_icc_profile (j_decompress_ptr cinfo,
     }
 
     /* Allocate space for assembled data */
-    icc_data = (JOCTET *) malloc(total_length * sizeof(JOCTET));
+    icc_data = new (std::nothrow) JOCTET[total_length];
 
     if (icc_data == nullptr) {
         return FALSE;    /* oops, out of memory */