Fixed findings

List of Findings

Error: GCC_ANALYZER_WARNING (CWE-401): [#def1]
util-linux-2.42.start/login-utils/last.c:48: included_from: Included from here.
util-linux-2.42.start/include/xalloc.h: scope_hint: In function ‘xstrdup’
util-linux-2.42.start/include/xalloc.h:95:17: warning[-Wanalyzer-malloc-leak]: leak of ‘xmalloc(8) + nfiles * 8’
util-linux-2.42.start/include/optutils.h:8: included_from: Included from here.
util-linux-2.42.start/login-utils/last.c:46: included_from: Included from here.
#   93|   	ret = strdup(str);
#   94|   	if (!ret)
#   95|-> 		err(XALLOC_EXIT_CODE, "cannot duplicate string");
#   96|   	return ret;
#   97|   }

Error: GCC_ANALYZER_WARNING (CWE-476): [#def2]
util-linux-2.42.start/lsfd-cmd/lsfd.c: scope_hint: In function ‘new_readlink_error_file’
util-linux-2.42.start/lsfd-cmd/lsfd.c:765:21: warning[-Wanalyzer-possible-null-dereference]: dereference of possibly-NULL ‘xcalloc(1, readlink_error_class.size)’
util-linux-2.42.start/include/c.h:19: included_from: Included from here.
#  763|   
#  764|   	file = xcalloc(1, readlink_error_class.size);
#  765|-> 	file->class = &readlink_error_class;
#  766|   
#  767|   	file->proc = proc;

Error: GCC_ANALYZER_WARNING (CWE-476): [#def3]
util-linux-2.42.start/lsfd-cmd/lsfd.c: scope_hint: In function ‘new_stat_error_file’
util-linux-2.42.start/lsfd-cmd/lsfd.c:785:21: warning[-Wanalyzer-possible-null-dereference]: dereference of possibly-NULL ‘xcalloc(1, stat_error_class.size)’
util-linux-2.42.start/lsfd-cmd/lsfd.c:900:26: note: in expansion of macro ‘list_last_entry’
#  783|   
#  784|   	file = xcalloc(1, stat_error_class.size);
#  785|-> 	file->class = &stat_error_class;
#  786|   
#  787|   	file->proc = proc;

Error: GCC_ANALYZER_WARNING (CWE-476): [#def4]
util-linux-2.42.start/misc-utils/blkid.c: scope_hint: In function ‘main’
util-linux-2.42.start/misc-utils/blkid.c:889:43: warning[-Wanalyzer-null-dereference]: dereference of NULL ‘xcalloc((long unsigned int)(argc - optind), 8)’
util-linux-2.42.start/misc-utils/blkid.c:18: included_from: Included from here.
#  887|   				continue;
#  888|   
#  889|-> 			devices[numdev++] = dev;
#  890|   		}
#  891|   

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