prism54: isl_ioctl: Remove unused variable 'j'

Fixes the following W=1 kernel build warning(s):

 drivers/net/wireless/intersil/prism54/isl_ioctl.c: In function ‘prism54_update_stats’:
 drivers/net/wireless/intersil/prism54/isl_ioctl.c:166:6: warning: variable ‘j’ set but not used [-Wunused-but-set-variable]

Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Aurelien Alleaume <slts@free.fr>
Cc: Valerio Riedel <hvr@gnu.org>
Cc: "Luis R. Rodriguez" <mcgrof@ruslug.rutgers.edu>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200826093401.1458456-24-lee.jones@linaro.org

drivers/net/wireless/intersil/prism54/isl_ioctl.c

@@ -163,7 +163,6 @@ prism54_update_stats(struct work_struct *work)
 {
 	islpci_private *priv = container_of(work, islpci_private, stats_work);
 	char *data;
-	int j;
 	struct obj_bss bss, *bss2;
 	union oid_res_t r;
 
@@ -187,7 +186,7 @@ prism54_update_stats(struct work_struct *work)
 	kfree(data);
 
 	/* now ask for the corresponding bss */
-	j = mgt_get_request(priv, DOT11_OID_BSSFIND, 0, (void *) &bss, &r);
+	mgt_get_request(priv, DOT11_OID_BSSFIND, 0, (void *) &bss, &r);
 	bss2 = r.ptr;
 	/* report the rssi and use it to calculate
 	 *  link quality through a signal-noise