options.c: option --help should yield exit code 0

--help is supported and there is no reason to signal failure

Change-Id: I59fda5336df47ec0b8172541a5fbfe60014bba7e
Signed-off-by: R. Diez <[email protected]>

Reviewed-on: https://review.openocd.org/c/openocd/+/8723
Tested-by: jenkins
Reviewed-by: Antonio Borneo <[email protected]>

Author: R. Diez

src/helper/options.c

@@ -334,7 +334,7 @@ int parse_cmdline_args(struct command_context *cmd_ctx, int argc, char *argv[])
 		LOG_OUTPUT("             | -d<n>\tset debug level to <level>\n");
 		LOG_OUTPUT("--log_output | -l\tredirect log output to file <name>\n");
 		LOG_OUTPUT("--command    | -c\trun <command>\n");
-		exit(-1);
+		exit(0);
 	}
 
 	if (version_flag) {