drivers/isdn: delete 'break' after 'return'

delete 'break' statement after 'return' statement
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/isdn/i4l/isdn_tty.c

@@ -3425,7 +3425,6 @@ isdn_tty_parse_at(modem_info *info)
 			p++;
 			isdn_tty_cmd_ATA(info);
 			return;
-			break;
 		case 'D':
 			/* D - Dial */
 			if (info->msr & UART_MSR_DCD)