Input: cyapa - mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Notice that in this particular case, I replaced the "Fallthrough state"
commern with a proper "Fall through", which is what GCC is expecting to
find.

Addresses-Coverity-ID: 114758 ("Missing break in switch")
Addresses-Coverity-ID: 114759 ("Missing break in switch")
Signed-off-by: Gustavo A. R. Silva <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/mouse/cyapa_gen3.c

···
 			return error;
 		}
 
-	/* Fallthrough state */
+	/* Fall through */
 	case CYAPA_STATE_BL_IDLE:
 		/* Try to get firmware version in bootloader mode. */
 		cyapa_gen3_bl_query_data(cyapa);
···
 			return error;
 		}
 
-	/* Fallthrough state */
+	/* Fall through */
 	case CYAPA_STATE_OP:
 		/*
 		 * Reading query data before going back to the full mode