md5: Consistently use item count as the first argument to calloc

Reported by:	GCC 14 -Wcalloc-transposed-args
Reviewed by:	rlibby
Differential Revision:	https://reviews.freebsd.org/D46009

(cherry picked from commit e8e2ab3c55228d66388a0b33de8c5ac4b3d6dbe9)

sbin/md5/md5.c

@@ -593,7 +593,7 @@ main(int argc, char *argv[])
 		while (argc--)
 			gnu_check(*argv++);
 		argc = 0;
-		argv = calloc(sizeof(char *), numrecs + 1);
+		argv = calloc(numrecs + 1, sizeof(char *));
 		for (rec = head; rec != NULL; rec = rec->next) {
 			argv[argc] = rec->filename;
 			argc++;