Without the 'break', assigning a pci device to a PV guest results in an abort,
since the code always falls through to the default abort case in the switch
statement.
Signed-off-by: Kaushik Kumar Ram <kaushik@rice.edu> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>