security: Fix comparison for virSecuritySELinuxRecallLabel
security: Fix comparison for virSecuritySELinuxRecallLabel

The @con type security_context_t is actually a "char *", so the
correct check should be to dereference one more level; otherwise,
we could return/use the NULL pointer later in a subsequent
virSecuritySELinuxSetFileconImpl call (using @fcon).

Suggested-by: Michal Prívozník <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

olafhering/libvirt,fabianfreyer/libvirt,libvirt/libvirt,eskultety/libvirt,crobinso/libvirt,jardasgit/libvirt,andreabolognani/libvirt,eskultety/libvirt,fabianfreyer/libvirt,olafhering/libvirt,crobinso/libvirt,olafhering/libvirt,nertpinx/libvirt,eskultety/libvirt,crobinso/libvirt,nertpinx/libvirt,eskultety/libvirt,andreabolognani/libvirt,eskultety/libvirt,olafhering/libvirt,zippy2/libvirt,jfehlig/libvirt,andreabolognani/libvirt,libvirt/libvirt,zippy2/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,zippy2/libvirt,libvirt/libvirt,andreabolognani/libvirt,zippy2/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,jardasgit/libvirt,libvirt/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,nertpinx/libvirt,nertpinx/libvirt,andreabolognani/libvirt,jardasgit/libvirt,jardasgit/libvirt,jardasgit/libvirt,crobinso/libvirt