USB gadget rndis: fix struct rndis_packet_msg_type unaligned bug

skb_push function may return a pointer which is not aligned as required
by struct rndis_packet_msg_type. Using attribute trick to fix this bug.
Signed-off-by: NRoy Huang <roy.huang@analog.com>
Signed-off-by: NJie Zhang <jie.zhang@analog.com>
Signed-off-by: NBryan Wu <bryan.wu@analog.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/rndis.h

@@ -195,7 +195,7 @@ struct rndis_packet_msg_type
 	__le32	PerPacketInfoLength;
 	__le32	VcHandle;
 	__le32	Reserved;
-};
+} __attribute__ ((packed));
 
 struct rndis_config_parameter
 {