brcmfmac: uninitialized "ret" variable

There is an error path where "ret" isn't initialized.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c

@@ -250,7 +250,7 @@ static int brcmf_sdiod_request_data(struct brcmf_sdio_dev *sdiodev, u8 fn,
 				    u32 addr, u8 regsz, void *data, bool write)
 {
 	struct sdio_func *func;
-	int ret;
+	int ret = -EINVAL;
 
 	brcmf_dbg(SDIO, "rw=%d, func=%d, addr=0x%05x, nbytes=%d\n",
 		  write, fn, addr, regsz);