ppb_message_loop_run_nested: fix uninitialized warning
ppb_message_loop_run_nested: fix uninitialized warning

reuben/freshplayerplugin,grevutiu-gabriel/freshplayerplugin,reuben/freshplayerplugin,Papapashu/freshplayerplugin,Papapashu/freshplayerplugin,grevutiu-gabriel/freshplayerplugin,reuben/freshplayerplugin,Papapashu/freshplayerplugin