Fixed defects

List of Defects

Error: GCC_ANALYZER_WARNING (CWE-476): [#def1]
xz-5.4.6-build/xz-5.4.6/src/liblzma/common/filter_encoder.c: scope_hint: In function 'lzma_mt_block_size'
xz-5.4.6-build/xz-5.4.6/src/liblzma/common/filter_encoder.c:259:23: warning[-Wanalyzer-null-dereference]: dereference of NULL '0'
xz-5.4.6-build/xz-5.4.6/src/liblzma/common/filter_encoder.c: scope_hint: In function 'lzma_mt_block_size'
#  257|   		const lzma_filter_encoder *const fe
#  258|   				= encoder_find(filters[i].id);
#  259|-> 		if (fe->block_size != NULL) {
#  260|   			const uint64_t size
#  261|   					= fe->block_size(filters[i].options);

Error: CLANG_WARNING: [#def2]
xz-5.4.6-build/xz-5.4.6/src/xz/args.c:97:13: warning[core.NonNullParamChecker]: Null pointer passed to 1st parameter expecting 'nonnull'
#   95|   	for (size_t i = 0; i < count; ++i) {
#   96|   		// Locate the next comma and replace it with \0.
#   97|-> 		char *p = strchr(str, ',');
#   98|   		if (p != NULL)
#   99|   			*p = '\0';

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