dahdi_dynamic_[loc|eth|ethmf]: Remove unused return value from transmit callback.

The return value from the transmit callback function was not used
anywhere, and is now removed.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Acked-by: Kinsey Moore <kmoore@digium.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9570 a0bf4364-ded3-4de4-8d8a-66a801d63aff

include/dahdi/kernel.h

@@ -1000,7 +1000,7 @@ struct dahdi_dynamic_driver {
 	void (*destroy)(void *tpipe);
 
 	/*! Transmit a given message */
-	int (*transmit)(void *tpipe, unsigned char *msg, int msglen);
+	void (*transmit)(void *tpipe, unsigned char *msg, int msglen);
 
 	/*! Flush any pending messages */
 	int (*flush)(void);