nfsd: nfsd4_create_file(): Move NFSD_MAY_CREATE check earlier

We only need NFS_MAY_CREATE check if the file doesn't exist, but it is
nfsd-specific code as it needs to check NFSEXP_READONLY and I want that
to be separate from vfs-specific code, which eventually all be provided
by the VFS.

So move that check earlier, but hold the error status until needed.

The if/else chain here looks a bit clumsy, but it will make a later
patch cleaner.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: NeilBrown <neil@brown.name>
Link: https://patch.msgid.link/20260717093001.1972119-10-neilb@ownmail.net
Signed-off-by: Chuck Lever <cel@kernel.org>

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