Fixed findings

List of Findings

Error: GCC_ANALYZER_WARNING (CWE-476): [#def1]
util-linux-2.42.start/misc-utils/cal.c: scope_hint: In function ‘monthly’
util-linux-2.42.start/misc-utils/cal.c:1084:28: warning[-Wanalyzer-null-dereference]: dereference of NULL ‘xcalloc((long unsigned int)*ctl.months_in_row, 208)’
util-linux-2.42.start/misc-utils/cal.c:79: included_from: Included from here.
# 1082|   
# 1083|   	for (i = 0; i < ctl->months_in_row - 1; i++)
# 1084|-> 		ms[i].next = &ms[i + 1];
# 1085|   
# 1086|   	rows = (ctl->num_months - 1) / ctl->months_in_row;

Error: GCC_ANALYZER_WARNING (CWE-476): [#def2]
util-linux-2.42.start/misc-utils/hardlink.c: scope_hint: In function ‘get_sorted_xattr_name_table’
util-linux-2.42.start/misc-utils/hardlink.c:528:26: warning[-Wanalyzer-null-dereference]: dereference of NULL ‘xcalloc((long unsigned int)n, 8) + (long unsigned int)i * 8’
util-linux-2.42.start/misc-utils/hardlink.c: scope_hint: In function ‘get_sorted_xattr_name_table’
util-linux-2.42.start/include/optutils.h:8: included_from: Included from here.
util-linux-2.42.start/misc-utils/hardlink.c:58: included_from: Included from here.
util-linux-2.42.start/misc-utils/hardlink.c:251:21: note: in expansion of macro ‘is_log_enabled’
util-linux-2.42.start/misc-utils/hardlink.c:562:9: note: in expansion of macro ‘jlog’
util-linux-2.42.start/misc-utils/hardlink.c:55: included_from: Included from here.
#  526|   
#  527|   	for (i = 0; i < n; i++) {
#  528|-> 		table[i] = names;
#  529|   		names += strlen(names) + 1;
#  530|   	}

Error: GCC_ANALYZER_WARNING (CWE-476): [#def3]
util-linux-2.42.start/misc-utils/waitpid.c: scope_hint: In function ‘open_pidfds’
util-linux-2.42.start/misc-utils/waitpid.c:63:27: warning[-Wanalyzer-null-dereference]: dereference of NULL ‘xcalloc(n_pids, 4)’
util-linux-2.42.start/include/strutils.h:55:64: note: in definition of macro ‘strtopid_or_err’
util-linux-2.42.start/misc-utils/waitpid.c:53:55: note: in expansion of macro ‘_’
#   61|   
#   62|   	for (size_t i = 0; i < n_pids; i++) {
#   63|-> 		pidfds[i] = pidfd_open(pids[i], 0);
#   64|   		if (pidfds[i] == -1) {
#   65|   			if (allow_exited && errno == ESRCH) {

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