Report config file name on error

Change-Id: If3f97452e4defb5c8dd540dd75045d37824fb305
diff --git a/osysmon_main.c b/osysmon_main.c
index eaed1a9..98859ed 100644
--- a/osysmon_main.c
+++ b/osysmon_main.c
@@ -129,7 +129,7 @@
 
 	rc = vty_read_config_file(config_file, NULL);
 	if (rc < 0) {
-		fprintf(stderr, "Failed to parse the config file\n");
+		fprintf(stderr, "Failed to parse the config file %s\n", config_file);
 		exit(2);
 	}