HLS: Fix error when stream has extension. #4215 v5.0.217 (#4216) #3644

Job	Run time
cygwin64-cache	1m 43s
multiple-arch-armv7	5m 25s
multiple-arch-aarch64	5m 42s
utest-regression-blackbox-test	3m 56s
fast	1s
cygwin64	5m 46s
build-ubuntu20	1m 46s
build-cross-aarch64	2m 19s
build-cross-arm	2m 25s
build-centos7	2m 22s
build-ubuntu16	1m 34s
build-ubuntu18	1m 38s
coverage	2m 41s
multiple-arch-amd64	1m 19s
done	2s
	38m 39s

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