[pull] master from linux-nvme:master#244
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Replace strdup() with xstrdup() when duplicating the subsystem NQN. Unlike strdup(), xstrdup() safely returns NULL when passed a NULL pointer, avoiding undefined behavior if subsysnqn is NULL. Also check the return value from xstrdup() and bail out early if duplicating the subsystem NQN fails, either because the input pointer is NULL or because memory allocation was unsuccessful. This issue was reported by the clang static analyzer. Signed-off-by: Sarah Ahmed <sarah.ahmed@ibm.com>
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