wifi: zd1211rw: fix potential memory leak in __zd_usb_enable_rx()

The memory allocated for urbs with kcalloc() is not freed on any error
path. Fix that by freeing it in the error path.

Fixes: e85d091 ("[PATCH] ZyDAS ZD1211 USB-WLAN driver")
Signed-off-by: Abdun Nihaal <nihaal@cse.iitm.ac.in>
Link: https://patch.msgid.link/20251028174341.139134-1-nihaal@cse.iitm.ac.in
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Author: Abdun Nihaal

drivers/net/wireless/zydas/zd1211rw/zd_usb.c

@@ -791,6 +791,7 @@ static int __zd_usb_enable_rx(struct zd_usb *usb)
 	if (urbs) {
 		for (i = 0; i < RX_URBS_COUNT; i++)
 			free_rx_urb(urbs[i]);
+		kfree(urbs);
 	}
 	return r;
 }