drm/amdgpu: make function uvd_v6_0_enc_get_destroy_msg static

The function uvd_v6_0_enc_get_destroy_msg is local to the source and
does not need to be in global scope, so make it static.

Cleans up sparse warning:
symbol 'uvd_v6_0_enc_get_destroy_msg' was not declared. Should it be
static?
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c

@@ -268,8 +268,9 @@ static int uvd_v6_0_enc_get_create_msg(struct amdgpu_ring *ring, uint32_t handle
  *
  * Close up a stream for HW test or if userspace failed to do so
  */
-int uvd_v6_0_enc_get_destroy_msg(struct amdgpu_ring *ring, uint32_t handle,
-				 bool direct, struct dma_fence **fence)
+static int uvd_v6_0_enc_get_destroy_msg(struct amdgpu_ring *ring,
+					uint32_t handle,
+					bool direct, struct dma_fence **fence)
 {
 	const unsigned ib_size_dw = 16;
 	struct amdgpu_job *job;