svcrdma: Const-ify the xdr_buf arguments

Clean up: Ensure the code in rw.c does not modify the argument, and
enable callers to also use "const struct xdr_buf *".

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-03-13 10:42:10 -04:00
commit 51bad8cc13