drm/msm/hdmi: fix semicolon.cocci warnings

 Remove unneeded semicolon.

Generated by: scripts/coccinelle/misc/semicolon.cocci

CC: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Rob Clark <robdclark@gmail.com>