tcti-msim: Fix call of socket_xmit_buf in send_sim_session_end. #782

Job	Run time
test-coverage	5m 27s
scanbuild	6m 40s
coverity-test	0s
build-test (ubuntu-20.04, gcc)	4m 26s
test-fuzz	2m 29s
test-mbedtls (ubuntu-20.04)	2m 49s
build-test (ubuntu-20.04, clang)	4m 25s
test-no-crypto-build	1m 16s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 39s
build-test (fedora-32, gcc)	4m 31s
build-test (fedora-32, clang)	5m 0s
test-tcti-config	14m 7s
build-test (opensuse-leap, gcc)	4m 30s
build-test (opensuse-leap, clang)	4m 45s
build-test (ubuntu-22.04, gcc)	4m 50s
build-test (ubuntu-22.04, clang)	4m 37s
build-test (alpine-3.15, gcc)	4m 1s
build-test (alpine-3.15, clang)	4m 48s
	1h 21m 20s

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