rtos: fix bug in error handling

checking for != ERROR_FAIL is broken.

Change-Id: Id7085afac653bb9c38d08928227a9ea402d8e6e9
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
Reviewed-on: http://openocd.zylin.com/351
Tested-by: jenkins
Reviewed-by: Michel JAOUEN <michel.jaouen@stericsson.com>
Reviewed-by: Øyvind Harboe <oyvindharboe@gmail.com>

src/server/gdb_server.c

@@ -1039,8 +1039,8 @@ static int gdb_get_registers_packet(struct connection *connection,
 	LOG_DEBUG("-");
 #endif
 
-	if ( ( target->rtos != NULL ) &&
-		 ( ERROR_FAIL != rtos_get_gdb_reg_list( connection, &reg_list, &reg_list_size) ) )
+	if ((target->rtos != NULL) &&
+		(ERROR_OK == rtos_get_gdb_reg_list(connection, &reg_list, &reg_list_size)))
 	{
 		return ERROR_OK;
 	}