tcti-msim: Fix call of socket_xmit_buf in send_sim_session_end. #783

Job	Run time
coverity-test	0s
test-coverage	5m 8s
scanbuild	6m 33s
build-test (ubuntu-20.04, gcc)	4m 26s
build-test (ubuntu-20.04, clang)	4m 29s
test-fuzz	2m 29s
test-mbedtls (ubuntu-20.04)	2m 58s
build-test (fedora-32, gcc)	4m 45s
test-no-crypto-build	1m 26s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 52s
build-test (fedora-32, clang)	4m 54s
test-tcti-config	14m 8s
build-test (opensuse-leap, gcc)	4m 27s
build-test (opensuse-leap, clang)	4m 39s
build-test (ubuntu-22.04, gcc)	4m 23s
build-test (ubuntu-22.04, clang)	4m 28s
build-test (alpine-3.15, gcc)	3m 57s
build-test (alpine-3.15, clang)	4m 47s
	1h 20m 49s

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