drm/i915/skl: fix semicolon.cocci warnings

drivers/gpu/drm/i915/intel_pm.c:2913:4-5: Unneeded semicolon

 Removes unneeded semicolon.

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

CC: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_pm.c

@@ -2910,7 +2910,7 @@ static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 				break;
 			case 8:
 				WARN(1, "Unsupported pixel depth for rotation");
-			};
+			}
 		}
 		y_tile_minimum = plane_blocks_per_line * min_scanlines;
 		selected_result = max(method2, y_tile_minimum);