proc_parse: allocate memory for the terminating null of the string

CID 996207 (#1 of 1): Out-of-bounds access (OVERRUN)
5. alloc_strlen: Allocating insufficient memory for the terminating null of the string.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

proc_parse.c

@@ -770,7 +770,7 @@ static int parse_mountinfo_ent(char *str, struct mount_info *new)
 	new->fstype = find_fstype_by_name(fstype);
 	free(fstype);
 
-	new->options = xmalloc(strlen(opt));
+	new->options = xmalloc(strlen(opt) + 1);
 	if (!new->options)
 		return -1;