char: mwave: remove unneeded break

A break is not needed if it is preceded by a return

Signed-off-by: Tom Rix <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/char/mwave/mwavedd.c

···
 	
 		default:
 			return -ENOTTY;
-			break;
 	} /* switch */
 
 	PRINTK_2(TRACE_MWAVE, "mwavedd::mwave_ioctl, exit retval %x\n", retval);