Bugfix: use next instead of return to continue listen for events #4773

Job	Run time
Spec FreeBSD	2m 15s
Lint check	1m 1s
Format check	11s
Compile LavinMQ	1m 6s
Lint javascript	13s
Lint OpenAPI	14s
Filters for frontend specs	2s
Spec	2m 6s
Spec OS X	2m 46s
RabbitMQ HTTP API Go client test	1m 1s
Test in release mode	20s
RabbitMQ java client test	5m 1s
Bunny client test	2m 29s
RabbitMQ HTTP API Ruby client test	55s
Frontend specs	0s
	19m 40s

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