util: Fix uninitalized variable to avoid garbage
util: Fix uninitalized variable to avoid garbage

This commit fixes an unitialized variable to avoid garbage value
when virNetDevBridgeGet method returns error. When, that method fails
before initialize 'val' variable, it can cause problems related to
that.

Signed-off-by: Julio Faracco <a9e27ab562b8d02c0041eb70cde6fe3858219fb7@gmail.com>
Reviewed-by: Erik Skultety <2c14d38fa47c8799f1b9c16280abe27f8edfec6e@redhat.com>

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