drm/amd/display: Clean up some inconsistent indenting

Eliminate the follow smatch warning:

drivers/gpu/drm/amd/amdgpu/../display/dmub/src/dmub_srv.c:622
dmub_srv_cmd_execute() warn: inconsistent indenting.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c

@@ -623,7 +623,7 @@ enum dmub_status dmub_srv_cmd_execute(struct dmub_srv *dmub)
 	flush_rb.rptr = dmub->inbox1_last_wptr;
 	dmub_rb_flush_pending(&flush_rb);
 
-		dmub->hw_funcs.set_inbox1_wptr(dmub, dmub->inbox1_rb.wrpt);
+	dmub->hw_funcs.set_inbox1_wptr(dmub, dmub->inbox1_rb.wrpt);
 
 	dmub->inbox1_last_wptr = dmub->inbox1_rb.wrpt;