Returning -1 does not fail like it should in MSys.

We need to return 1 rather than -1 on failure since -1 does not seem to signal
an error in MSys.

Signed-off-by: Mike Pape <dotzenlabs@gmail.com>

config.c

@@ -436,7 +436,7 @@ int git_config_from_file(config_fn_t fn, const char *filename)
 	int ret;
 	FILE *f = fopen(filename, "r");
 
-	ret = -1;
+	ret = 1;
 	if (f) {
 		config_file = f;
 		config_file_name = filename;