staging: rtl8188eu: Fix an indent coding style issue

Only a single tab space is required after the if statement.
Fix this issue by running scripts/checkpatch.pl on the file.
Signed-off-by: Mrinal Pandey <mrinalmni@gmail.com>
Link: https://lore.kernel.org/r/20200722151900.5dcebtavkdi5cc77@mrinalpandeySigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_recv.c

@@ -671,8 +671,8 @@ static int sta2sta_data_frame(struct adapter *adapter,
 		if (mcast) {
 			/*  For AP mode, if DA == MCAST, then BSSID should be also MCAST */
 			if (!is_multicast_ether_addr(pattrib->bssid)) {
-					ret = _FAIL;
-					goto exit;
+				ret = _FAIL;
+				goto exit;
 			}
 		} else { /*  not mc-frame */
 			/*  For AP mode, if DA is non-MCAST, then it must be BSSID, and bssid == BSSID */