Fix static analysis warnings and memory leaks (cppcheck)

[rkt0209]

This PR resolves a series of warnings and errors caught by cppcheck static analysis across the codebase.

Key fixes include:

• Memory Leaks: Fixed realloc memory leak patterns (nulled but not freed upon failure) in catalog.c, filter.c, pwgtopdf.c, and testfilters.c. Added missing pdfioFileClose() in pclmtoraster.c and freed leaked structs in bannertopdf.c.
• Null Pointer Dereferences: Added safety guards and corrected order of operations to prevent cross-translation unit (CTU) null pointer dereferences in image.c, libcups2.c, and pdftopdf.c.
• Uninitialized Variables: Handled uninitialized pdfio_matrix_t variables in pdftopdf.c by explicitly defining them as identity matrices.
• Format Specifiers: Fixed [invalidPrintfArgType_sint] warnings by changing %d to %u where unsigned int variables were being passed in ghostscript.c, pwgtopdf.c, and test-analyze.c.
• False Positives: Added cppcheck-suppress comments for known macro-expansion false positives in sfnt.c and test-analyze.c to keep CI logs clean.

All changes have been tested locally and successfully compile.