drm/amdgpu: simplify the return expression of navi10_ih_hw_init()

Simplify the return expression.
Reported-by: NZeal Robot <zealci@zte.com.cn>
Signed-off-by: NMinghao Chi <chi.minghao@zte.com.cn>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/navi10_ih.c

@@ -593,14 +593,9 @@ static int navi10_ih_sw_fini(void *handle)
 
 static int navi10_ih_hw_init(void *handle)
 {
-	int r;
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	r = navi10_ih_irq_init(adev);
-	if (r)
-		return r;
-
-	return 0;
+	return navi10_ih_irq_init(adev);
 }
 
 static int navi10_ih_hw_fini(void *handle)