Using official fix for packJPG memory corruption

- See issue #17
- See packJPG git:
packjpg/packJPG@2d62eda

contrib/packjpg/bitops.cpp

@@ -18,9 +18,8 @@ reading and writing of arrays
 
 // special realloc with guaranteed free() of previous memory
 static inline void* frealloc( void* ptr, size_t size ) {
-	void* n_ptr = realloc( ptr, size );
-	// changed by schnaader to fix a bug: if size == 0, realloc will free the memory and n_ptr == NULL, in this case don't call free
-	if (( n_ptr == NULL ) && (size != 0)) free( ptr );
+	void* n_ptr = realloc( ptr, (size) ? size : 1 );
+	if ( n_ptr == NULL ) free( ptr );
 	return n_ptr;
 }
 

contrib/packjpg/packjpg.cpp

@@ -322,7 +322,7 @@ packJPG by Matthias Stirner, 01/2014
 
 // special realloc with guaranteed free() of previous memory
 static inline void* frealloc( void* ptr, size_t size ) {
-	void* n_ptr = realloc( ptr, size );
+	void* n_ptr = realloc( ptr, (size) ? size : 1 );
 	if ( n_ptr == NULL ) free( ptr );
 	return n_ptr;
 }