(main): Allocate COLLECT_NAME string with xmalloc.

From-SVN: r4902

gcc/collect2.c

@@ -736,8 +736,7 @@ main (argc, argv)
 
   last_file_name = getenv ("COLLECT_NAME");
 
-  p = (char *) xcalloc (sizeof (char *),
-			strlen (our_file_name) + strlen ("COLLECT_NAME=") + 1);
+  p = (char *) xmalloc (strlen (our_file_name) + strlen ("COLLECT_NAME=") + 1);
   sprintf (p, "COLLECT_NAME=%s", our_file_name);
   putenv (p);