staging: r8192e_pci: fix htons error

A sparse error fixup removed a htons() which is required for the driver
to function. This patch puts the htons() back and fixes the sparse
warning correctly by changing the left side cast.

Signed-off-by: Sean MacLennan <[e-mail]>
Cc: stable <[e-mail]> # 3.14
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/rtl8192e/rtllib_tx.c

···
 	snap->oui[1] = oui[1];
 	snap->oui[2] = oui[2];
 
-	*(u16 *)(data + SNAP_SIZE) = h_proto;
+	*(__be16 *)(data + SNAP_SIZE) = htons(h_proto);
 
 	return SNAP_SIZE + sizeof(u16);
 }