Fixed defects

List of Defects

Error: GCC_ANALYZER_WARNING (CWE-775): [#def1]
libwebp-1.3.2-build/libwebp-1.3.2/examples/cwebp.c: scope_hint: In function ‘DumpPicture’
libwebp-1.3.2-build/libwebp-1.3.2/examples/cwebp.c:322:26: warning[-Wanalyzer-file-leak]: leak of FILE ‘fopen(PGM_name, "wb")’
libwebp-1.3.2-build/libwebp-1.3.2/examples/cwebp.c:29: included_from: Included from here.
libwebp-1.3.2-build/libwebp-1.3.2/examples/cwebp.c:319:19: note: in expansion of macro ‘WFOPEN’
#  320|     if (f == NULL) return 0;
#  321|     fprintf(f, "P5\n%d %d\n255\n", stride, height);
#  322|->   for (y = 0; y < picture->height; ++y) {
#  323|       if (fwrite(src_y, picture->width, 1, f) != 1) return 0;
#  324|       if (picture->width & 1) fputc(0, f);  // pad

Error: GCC_ANALYZER_WARNING (CWE-401): [#def2]
libwebp-1.3.2-build/libwebp-1.3.2/examples/cwebp.c:322:26: warning[-Wanalyzer-malloc-leak]: leak of ‘fopen(PGM_name, "wb")’
libwebp-1.3.2-build/libwebp-1.3.2/examples/cwebp.c:319:19: note: in expansion of macro ‘WFOPEN’
#  320|     if (f == NULL) return 0;
#  321|     fprintf(f, "P5\n%d %d\n255\n", stride, height);
#  322|->   for (y = 0; y < picture->height; ++y) {
#  323|       if (fwrite(src_y, picture->width, 1, f) != 1) return 0;
#  324|       if (picture->width & 1) fputc(0, f);  // pad

Error: CLANG_WARNING: [#def3]
libwebp-1.3.2-build/libwebp-1.3.2/sharpyuv/sharpyuv.c:190:15: warning[core.CallAndMessage]: 3rd function call argument is an uninitialized value
#  188|     while (k-- > 0) {   // process each R/G/B segments in turn
#  189|       // special boundary case for i==0
#  190|->     out1[0] = Filter2(cur_uv[0], prev_uv[0], best_y[0], bit_depth);
#  191|       out2[0] = Filter2(cur_uv[0], next_uv[0], best_y[w], bit_depth);
#  192|   

Error: CLANG_WARNING: [#def4]
libwebp-1.3.2-build/libwebp-1.3.2/src/mux/muxedit.c:557:5: warning[deadcode.DeadStores]: Value stored to 'err' is never read
#  555|     if (num_frames == 1) {
#  556|       WebPMuxImage* frame = NULL;
#  557|->     err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, 1, &frame);
#  558|       assert(err == WEBP_MUX_OK);  // We know that one frame does exist.
#  559|       assert(frame != NULL);

Error: CPPCHECK_WARNING: [#def5]
libwebp-1.3.2-build/libwebp-1.3.2/src/utils/utils.c: information[normalCheckLevelMaxBranches]: Limiting analysis of branches. Use --check-level=exhaustive to analyze all branches.

Error: GCC_ANALYZER_WARNING (CWE-457): [#def6]
libwebp-1.3.2-build/libwebp-1.3.2/src/utils/utils.c: scope_hint: In function ‘WebPGetColorPalette’
libwebp-1.3.2-build/libwebp-1.3.2/src/utils/utils.c:288:26: warning[-Wanalyzer-use-of-uninitialized-value]: use of uninitialized value ‘colors[key]’
libwebp-1.3.2-build/libwebp-1.3.2/src/utils/utils.c: scope_hint: In function ‘WebPGetColorPalette’
#  286|             }
#  287|             break;
#  288|->         } else if (colors[key] == last_pix) {
#  289|             break;  // The color is already there.
#  290|           } else {

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