net: dst.h: Fix shifting signed 32-bit value by 31 bits problem

Fix DST_FEATURE_ECN_CA to use "U" cast to avoid shifting signed
32-bit value by 31 bits problem.

Signed-off-by: Vandana BN <bnvandana@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed