A call to of_parse_phandle() is incrementing the refcount, of_node_put
must be called when done the work on it. Add missing of_node_put() after
the check for msi_np == np and MSI initialization.
Cc: stable@xxxxxxxxxxxxxxx # v5.10+
Fixes: 40ca1bf580ef ("PCI: brcmstb: Add MSI support")
Signed-off-by: Stanimir Varbanov <svarbanov@xxxxxxx>