[Bug] 无符号整形和负数进行判断是否相等

### RT-Thread Version

5.2.0

### Hardware Type/Architectures

stm32f1

### Develop Toolchain

Other

### Describe the bug

rt-thread\components\drivers\ipc\condvar.c    第50行 if (timeout != RT_WAITING_FOREVER)，timeout 为uint32_t类型，而RT_WAITING_FOREVER = -1，两者作判断，MDK报warning:  #68-D: integer conversion resulted in a change of sign

### Other additional context

_No response_