wip-librados-xattr: fix 13944, springing from "malloc(0) can return NULL on some platforms" #6779
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If an xattr is 0 length, don't try to malloc a buffer for the value; leave it NULL. (Linux doesn't promise malloc(0) returns a pointer, and other implementations, like AIX, definitely return NULL.) Usage changes are in following commits. Fixes: #13944 Signed-off-by: Dan Mick <dan.mick@redhat.com>
Prior commit changes rados{striper}_getxattrs_next to be able to return
NULL in the 'val' param. Handle that.
Fixes: #13944
Signed-off-by: Dan Mick <dan.mick@redhat.com>
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librados: avoid malloc(0) (which can return NULL on some platforms) Reviewed-by: Sage Weil <sage@redhat.com>
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