NFSD: Relocate nfsd4_decode_opaque()

Enable nfsd4_decode_opaque() to be used in more decoders, and
replace the READ* macros in nfsd4_decode_opaque().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-11-04 11:41:55 -05:00
commit 5dcbfabb67