md/md-llbitmap: Remove unneeded semicolon

Remove unnecessary semicolons reported by Coccinelle/coccicheck and the
semantic patch at scripts/coccinelle/misc/semicolon.cocci.

Link: https://lore.kernel.org/linux-raid/[e-mail]
Signed-off-by: Chen Ni <[e-mail]>
Signed-off-by: Yu Kuai <[e-mail]>

drivers/md/md-llbitmap.c

···
 		case BitClean:
 			pctl->state[pos] = BitDirty;
 			break;
-		};
+		}
 	}
 }