[ndctl PATCH] ndctl: permit NULL as a parameter to ndctl_cmd_unref

Similar to libc free() allow NULL as a valid parameter to this freeing routine. This mirrors the behavior of the other *_unref() routines in the library. Cc: Tiffany Kasanicky <tiffany.j.kasanicky(a)intel.com&gt; Reported-by: Linda Knippers <linda.knippers(a)hpe.com&gt; Signed-off-by: Dan Williams <dan.j.williams(a)intel.com&gt; --- ndctl/lib/libndctl.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/ndctl/lib/libndctl.c b/ndctl/lib/libndctl.c index 0722f79470c3..4b1247678a08 100644 --- a/ndctl/lib/libndctl.c +++ b/ndctl/lib/libndctl.c @@ -2122,6 +2122,8 @@ NDCTL_EXPORT int ndctl_dimm_zero_labels(struct ndctl_dimm *dimm) NDCTL_EXPORT void ndctl_cmd_unref(struct ndctl_cmd *cmd) { + if (!cmd) + return; if (--cmd->refcount == 0) { if (cmd->source) ndctl_cmd_unref(cmd->source);