nfsv3: remove unnecessary call of Inode#toString for logging

the call of Inode#toString for logging is redundant, especially when
logger is disabled.

Acked-by: Lea Morschel
Acked-by: Paul Millar
Target: master
(cherry picked from commit de0a8d4c)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
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