parse-opts: prepare for OPT_FILENAME

To give OPT_FILENAME the prefix, we pass the prefix to parse_options()
which passes the prefix to parse_options_start() which sets the prefix
member of parse_opts_ctx accordingly. If there isn't a prefix in the
calling context, passing NULL will suffice.

Signed-off-by: Stephen Boyd <bebarino@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin-remote.c b/builtin-remote.c
index 71abf68..13d5db1 100644
--- a/builtin-remote.c
+++ b/builtin-remote.c
@@ -79,7 +79,8 @@
 		OPT_END()
 	};
 
-	argc = parse_options(argc, argv, options, builtin_remote_usage, 0);
+	argc = parse_options(argc, argv, NULL, options, builtin_remote_usage,
+			     0);
 
 	if (argc < 2)
 		usage_with_options(builtin_remote_usage, options);
@@ -986,7 +987,8 @@
 	struct string_list info_list = { NULL, 0, 0, 0 };
 	struct show_info info;
 
-	argc = parse_options(argc, argv, options, builtin_remote_usage, 0);
+	argc = parse_options(argc, argv, NULL, options, builtin_remote_usage,
+			     0);
 
 	if (argc < 1)
 		return show_all();
@@ -1076,7 +1078,8 @@
 			    "delete refs/remotes/<name>/HEAD"),
 		OPT_END()
 	};
-	argc = parse_options(argc, argv, options, builtin_remote_usage, 0);
+	argc = parse_options(argc, argv, NULL, options, builtin_remote_usage,
+			     0);
 	if (argc)
 		strbuf_addf(&buf, "refs/remotes/%s/HEAD", argv[0]);
 
@@ -1130,7 +1133,8 @@
 		OPT_END()
 	};
 
-	argc = parse_options(argc, argv, options, builtin_remote_usage, 0);
+	argc = parse_options(argc, argv, NULL, options, builtin_remote_usage,
+			     0);
 
 	if (argc < 1)
 		usage_with_options(builtin_remote_usage, options);
@@ -1220,7 +1224,7 @@
 		OPT_END()
 	};
 
-	argc = parse_options(argc, argv, options, builtin_remote_usage,
+	argc = parse_options(argc, argv, NULL, options, builtin_remote_usage,
 			     PARSE_OPT_KEEP_ARGV0);
 	if (argc < 2) {
 		argc = 2;
@@ -1306,7 +1310,7 @@
 	};
 	int result;
 
-	argc = parse_options(argc, argv, options, builtin_remote_usage,
+	argc = parse_options(argc, argv, prefix, options, builtin_remote_usage,
 		PARSE_OPT_STOP_AT_NON_OPTION);
 
 	if (argc < 1)