tty: serial: jsm: remove redundant pointer ch

Pointer ch is being assigned but is never used hence it is redundant
and can be removed.

Cleans up clang warning:
warning: variable 'ch' set but not used [-Wunused-but-set-variable]

Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/jsm/jsm_tty.c

···
 {
 	int i, rc;
 	unsigned int line;
-	struct jsm_channel *ch;
 
 	if (!brd)
 		return -ENXIO;
···
 	brd->nasync = brd->maxports;
 
 	/* Set up channel variables */
-	for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
+	for (i = 0; i < brd->nasync; i++) {
 
 		if (!brd->channels[i])
 			continue;