Fix total permission bogosity in "checkout-cache.c".

Use the proper octal mode naming instead of random decimal
crud, and don't reset the mode after the create with fchmod:
the whole point was to let "umask" do its thing.

Duh.

checkout-cache.c

@@ -54,7 +54,7 @@ static int create_file(const char *path, unsigned int mode)
 {
 	int fd;
 
-	mode = (mode & 0100) ? 777 : 666;
+	mode = (mode & 0100) ? 0777 : 0666;
 	fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
 	if (fd < 0) {
 		if (errno == ENOENT) {
@@ -62,8 +62,6 @@ static int create_file(const char *path, unsigned int mode)
 			fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
 		}
 	}
-	if (fd >= 0)
-		fchmod(fd, mode);
 	return fd;
 }