csum: eliminate sparse warning in remcsum_unadjust()

Cast second parameter of csum_sub() from __sum16 to __wsum.

Signed-off-by: Lance Richardson <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/checksum.h

···
 
 static inline void remcsum_unadjust(__sum16 *psum, __wsum delta)
 {
-	*psum = csum_fold(csum_sub(delta, *psum));
+	*psum = csum_fold(csum_sub(delta, (__force __wsum)*psum));
 }
 
 #endif