Test

fix compile error in srs_protocol_rtmp_stack.cpp #3660

Job	Run time
multiple-arch-aarch64	22m 32s
cygwin64-cache	1m 46s
multiple-arch-armv7	21m 51s
utest-regression-blackbox-test	9m 31s
cygwin64	14m 58s
fast	1s
build-ubuntu16	3m 2s
build-cross-aarch64	5m 4s
build-centos7	5m 19s
build-cross-arm	5m 24s
build-ubuntu18	3m 17s
build-ubuntu20	3m 38s
coverage	3m 47s
multiple-arch-amd64	2m 23s
test-done	1s
	1h 42m 34s

Provide feedback