NFSD: Fix space and spelling mistake

[ Upstream commit f532c9ff ]

Add a blank space after ','.
Change 'succesful' to 'successful'.

Signed-off-by: Zhang Jiaming <jiaming@nfschina.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>