[bug][pin] 修复错误码没有为负的错误

components/drivers/misc/pin.c

@@ -6,6 +6,7 @@
  * Change Logs:
  * Date           Author       Notes
  * 2015-01-20     Bernard      the first version
+ * 2021-02-06     Meco Man     fix RT_ENOSYS code in negative
  */
 
 #include <drivers/pin.h>
@@ -108,7 +109,7 @@ rt_err_t rt_pin_attach_irq(rt_int32_t pin, rt_uint32_t mode,
     {
         return _hw_pin.ops->pin_attach_irq(&_hw_pin.parent, pin, mode, hdr, args);
     }
-    return RT_ENOSYS;
+    return -RT_ENOSYS;
 }
 rt_err_t rt_pin_detach_irq(rt_int32_t pin)
 {
@@ -117,7 +118,7 @@ rt_err_t rt_pin_detach_irq(rt_int32_t pin)
     {
         return _hw_pin.ops->pin_detach_irq(&_hw_pin.parent, pin);
     }
-    return RT_ENOSYS;
+    return -RT_ENOSYS;
 }
 
 rt_err_t rt_pin_irq_enable(rt_base_t pin, rt_uint32_t enabled)
@@ -127,7 +128,7 @@ rt_err_t rt_pin_irq_enable(rt_base_t pin, rt_uint32_t enabled)
     {
         return _hw_pin.ops->pin_irq_enable(&_hw_pin.parent, pin, enabled);
     }
-    return RT_ENOSYS;
+    return -RT_ENOSYS;
 }
 
 /* RT-Thread Hardware PIN APIs */