Change return value on error.

On wrong parameters a error is signalized to the calling function.

Change-Id: I484443fdb39938e20382edc9246d5ec546a5c960
Signed-off-by: Mathias K <kesmtp@freenet.de>
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
Reviewed-on: http://openocd.zylin.com/282
Tested-by: jenkins
Reviewed-by: Øyvind Harboe <oyvindharboe@gmail.com>

src/pld/pld.c

@@ -63,8 +63,7 @@ COMMAND_HANDLER(handle_pld_device_command)
 
 	if (CMD_ARGC < 1)
 	{
-		LOG_WARNING("incomplete 'pld device' command");
-		return ERROR_OK;
+		return ERROR_COMMAND_SYNTAX_ERROR;
 	}
 
 	for (i = 0; pld_drivers[i]; i++)
@@ -155,8 +154,7 @@ COMMAND_HANDLER(handle_pld_load_command)
 
 	if (CMD_ARGC < 2)
 	{
-		command_print(CMD_CTX, "usage: pld load <device#> <file>");
-		return ERROR_OK;
+		return ERROR_COMMAND_SYNTAX_ERROR;
 	}
 
 	unsigned dev_id;