jsm: Removing unused jsm_channel->ch_wopen field

Currently the jsm_channel->ch_wopen field is defined and never
used. So, this patch removes it.
Signed-off-by: NBreno Leitão <leitao@linux.vnet.ibm.com>
Cc: Scott Kilau <Scott.Kilau@digi.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/serial/jsm/jsm.h

@@ -213,8 +213,6 @@ struct jsm_channel {
 	u8		ch_stopc;	/* Stop character		*/
 	u8		ch_startc;	/* Start character		*/
 
-	u32		ch_wopen;	/* Waiting for open process cnt */
-
 	u8		ch_mostat;	/* FEP output modem status	*/
 	u8		ch_mistat;	/* FEP input modem status	*/