net: Fix various endianness glitches

Sparse can help us find endianness bugs, but we need to make some
cleanups to be able to more easily spot real bugs.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index dc6e0b8..92a122b 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -144,7 +144,8 @@
 	 *	htonl(1 << ((~fn_bit)&0x1F))
 	 * See include/asm-generic/bitops/le.h.
 	 */
-	return (1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)) & addr[fn_bit >> 5];
+	return (__force __be32)(1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)) &
+	       addr[fn_bit >> 5];
 }
 
 static __inline__ struct fib6_node * node_alloc(void)