net/hamradio/6pack: remove redundant variable channel

Variable channel is being assigned but is never used hence it is
redundant and can be removed.

Cleans up two clang warnings:
warning: variable 'channel' set but not used [-Wunused-but-set-variable]
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/hamradio/6pack.c

@@ -878,10 +878,8 @@ static void decode_data(struct sixpack *sp, unsigned char inbyte)
 
 static void decode_prio_command(struct sixpack *sp, unsigned char cmd)
 {
-	unsigned char channel;
 	int actual;
 
-	channel = cmd & SIXP_CHN_MASK;
 	if ((cmd & SIXP_PRIO_DATA_MASK) != 0) {     /* idle ? */
 
 	/* RX and DCD flags can only be set in the same prio command,
@@ -933,10 +931,9 @@ static void decode_prio_command(struct sixpack *sp, unsigned char cmd)
 
 static void decode_std_command(struct sixpack *sp, unsigned char cmd)
 {
-	unsigned char checksum = 0, rest = 0, channel;
+	unsigned char checksum = 0, rest = 0;
 	short i;
 
-	channel = cmd & SIXP_CHN_MASK;
 	switch (cmd & SIXP_CMD_MASK) {     /* normal command */
 	case SIXP_SEOF:
 		if ((sp->rx_count == 0) && (sp->rx_count_cooked == 0)) {