Fixed findings

List of Findings

Error: GCC_ANALYZER_WARNING (CWE-476): [#def1]
util-linux-2.43.devel/disk-utils/fdformat.c: scope_hint: In function ‘verify_disk’
util-linux-2.43.devel/disk-utils/fdformat.c:129:49: warning[-Wanalyzer-possible-null-dereference]: dereference of possibly-NULL ‘xmalloc(track_size) + count’
util-linux-2.43.devel/disk-utils/fdformat.c:28: included_from: Included from here.
#  127|   				}
#  128|   				for (count = 0; count < track_size; count++)
#  129|-> 					if (data[count] != FD_FILL_BYTE) {
#  130|   						if (retries_left) {
#  131|   							format_begin(ctrl);

Error: GCC_ANALYZER_WARNING (CWE-476): [#def2]
util-linux-2.43.devel/misc-utils/cal.c: scope_hint: In function ‘monthly’
util-linux-2.43.devel/misc-utils/cal.c:1099:28: warning[-Wanalyzer-null-dereference]: dereference of NULL ‘xcalloc((long unsigned int)*ctl.months_in_row, 208) + (sizetype)i * 208’
util-linux-2.43.devel/misc-utils/cal.c:79: included_from: Included from here.
# 1097|   
# 1098|   	for (i = 0; i < ctl->months_in_row - 1; i++)
# 1099|-> 		ms[i].next = &ms[i + 1];
# 1100|   
# 1101|   	rows = (ctl->num_months - 1) / ctl->months_in_row;

Error: GCC_ANALYZER_WARNING (CWE-688): [#def3]
util-linux-2.43.devel/misc-utils/rename.c: scope_hint: In function ‘do_symlink’
util-linux-2.43.devel/misc-utils/rename.c:169:15: warning[-Wanalyzer-possible-null-argument]: use of possibly-NULL ‘xmalloc((long unsigned int)(sb.st_size + 1))’ where non-null expected
util-linux-2.43.devel/misc-utils/rename.c:31: included_from: Included from here.
/usr/include/unistd.h:838:16: note: argument 2 of ‘readlink’ must be non-null
#  167|   	target = xmalloc(sb.st_size + 1);
#  168|   
#  169|-> 	ssz = readlink(s, target, sb.st_size + 1);
#  170|   	if (ssz < 0) {
#  171|   		warn(_("%s: readlink failed"), s);

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