If regulator_bulk_get() returns an error, no regulators are created and we
need to set their number to zero. If we do not do this and the PCIe
link-up fails, regulator_bulk_free() will be invoked and effect a panic.
Also print out the error value, as we cannot return an error upwards as
Linux will WARN on an error from add_bus().
Fixes: 9e6be018b263 ("PCI: brcmstb: Enable child bus device regulators from DT")
Signed-off-by: Jim Quinlan <james.quinlan@xxxxxxxxxxxx>