[cximage] Fix memleak in ximadsp.
[cximage] Fix uninitialized struct member in ximadsp.
[cximage] Fix common realloc mistake: 'm_pBuffer' nulled but not freed upon failure in xmemfile.
[cximage] Fix invalid number of character ({) when these macros are defined: 'PNG_NO_WRITE_FILTERING' in pngwutil.
[cximage] Fix possible "Buffer is accessed out of bounds: romm_cam" error in dcraw.
[cximage] Fix resource leak in dcraw.
[cximage] Fix possible "Buffer is accessed out of bounds: romm_cam" error in libdcr.
Merge pull request #3332 from ace20022/cximage_fixes

[Fix] Some cximage fixes