drm/msm: fix spelling mistake: "ringubffer" -> "ringbuffer"

Trivial fix to spelling mistake in DRM_DEV_ERROR error message
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NRob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/adreno/adreno_gpu.c

@@ -461,7 +461,7 @@ void adreno_wait_ring(struct msm_ringbuffer *ring, uint32_t ndwords)
 {
 	if (spin_until(ring_freewords(ring) >= ndwords))
 		DRM_DEV_ERROR(ring->gpu->dev->dev,
-			"timeout waiting for space in ringubffer %d\n",
+			"timeout waiting for space in ringbuffer %d\n",
 			ring->id);
 }