rtlwifi: convert to __packed notation

Use "__packed" instead of "__attribute__ ((packed))"...

Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rtlwifi/pci.h b/drivers/net/wireless/rtlwifi/pci.h
index cdde858..d36a669 100644
--- a/drivers/net/wireless/rtlwifi/pci.h
+++ b/drivers/net/wireless/rtlwifi/pci.h
@@ -131,15 +131,15 @@
 
 struct rtl_rx_desc {
 	u32 dword[8];
-} __attribute__ ((packed));
+} __packed;
 
 struct rtl_tx_desc {
 	u32 dword[16];
-} __attribute__ ((packed));
+} __packed;
 
 struct rtl_tx_cmd_desc {
 	u32 dword[16];
-} __attribute__ ((packed));
+} __packed;
 
 struct rtl8192_tx_ring {
 	struct rtl_tx_desc *desc;