drm/amd/amdgpu: get rid of else branch

else branch is pointless if it's right at the end of function and use
unlikely() on err path.
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Nikola Pajkovsky <npajkovsky@suse.cz>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -1734,9 +1734,11 @@ static inline void amdgpu_ring_write_multiple(struct amdgpu_ring *ring, void *sr
 	unsigned occupied, chunk1, chunk2;
 	void *dst;
 
-	if (ring->count_dw < count_dw) {
+	if (unlikely(ring->count_dw < count_dw)) {
 		DRM_ERROR("amdgpu: writing more dwords to the ring than expected!\n");
-	} else {
+		return;
+	}
+
 	occupied = ring->wptr & ring->buf_mask;
 	dst = (void *)&ring->ring[occupied];
 	chunk1 = ring->buf_mask + 1 - occupied;
@@ -1757,7 +1759,6 @@ static inline void amdgpu_ring_write_multiple(struct amdgpu_ring *ring, void *sr
 	ring->wptr += count_dw;
 	ring->wptr &= ring->ptr_mask;
 	ring->count_dw -= count_dw;
-	}
 }
 
 static inline struct amdgpu_sdma_instance *