double free in builtin-update-index.c

path_name is either ptr that should not be freed, or a pointer to a strbuf
buffer that is deallocated when exiting the loop. Don't do that !

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-update-index.c

@@ -377,8 +377,6 @@ static void read_index_info(int line_termination)
 				die("git-update-index: unable to update %s",
 				    path_name);
 		}
-		if (path_name != ptr)
-			free(path_name);
 		continue;
 
 	bad_line: