Staging: rtl8192u: ieee80211: added missing space around '='

This patch fixes the following checkpatch error:
  - ERROR: spaces required around that '='

Signed-off-by: Kurt Kanzenbach <kurt@kmk-computers.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c
index 8091f49..6c48df1 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c
@@ -360,7 +360,7 @@
 		icv[3] = crc >> 24;
 		crypto_blkcipher_setkey(tkey->tx_tfm_arc4, rc4key, 16);
 		sg_init_one(&sg, pos, len+4);
-		ret= crypto_blkcipher_encrypt(&desc, &sg, &sg, len + 4);
+		ret = crypto_blkcipher_encrypt(&desc, &sg, &sg, len + 4);
 	}
 
 	tkey->tx_iv16++;