ipv4: eliminate endianness warnings in ip_fib.h

fib_multipath_hash() computes a hash using __be32 values, force
cast these to u32 to pacify sparse.
Signed-off-by: Lance Richardson <lrichard@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip_fib.h

@@ -325,7 +325,8 @@ extern u32 fib_multipath_secret __read_mostly;
 
 static inline int fib_multipath_hash(__be32 saddr, __be32 daddr)
 {
-	return jhash_2words(saddr, daddr, fib_multipath_secret) >> 1;
+	return jhash_2words((__force u32)saddr, (__force u32)daddr,
+			    fib_multipath_secret) >> 1;
 }
 
 void fib_select_multipath(struct fib_result *res, int hash);