[PATCH XENSTORE v1 01/10] xenstore: add missing NULL check

[Ian Jackson <iwj@xxxxxxxxxxxxxx>]

Norbert Manthey writes ("[PATCH XENSTORE v1 01/10] xenstore: add missing NULL 
check"):
> In case of allocation error, we should not dereference the obtained
> NULL pointer. Hence, fail early.
> 
> This bug was discovered and resolved using Coverity Static Analysis
> Security Testing (SAST) by Synopsys, Inc.
> 
> Signed-off-by: Norbert Manthey <nmanthey@xxxxxxxxx>
> Reviewed-by: Thomas Friebel <friebelt@xxxxxxxxx>
> Reviewed-by: Julien Grall <jgrall@xxxxxxxxxxxx>

Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>