nfs: nfs4clinet: check the return value of kstrdup()
[ Upstream commit fbd2057e ] kstrdup() returns NULL when some internal memory errors happen, it is better to check the return value of it so to catch the memory error in time. Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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eb01a628
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