This fixes the following leaks detected by ASan in
./tests/test-alpha-blending:
Direct leak of 176 byte(s) in 2 object(s) allocated from:
#0 0x7fb447880518 in calloc (/lib/x86_64-linux-gnu/libasan.so.5+0xe9518)
#1 0x7fb4432c12d7 in zalloc ../../git/weston/include/libweston/zalloc.h:38
#2 0x7fb4432c2ca6 in weston_desktop_xwayland_init ../../git/weston/libweston-desktop/xwayland.c:410
#3 0x7fb4432baadf in weston_desktop_create ../../git/weston/libweston-desktop/libweston-desktop.c:87
#4 0x7fb4432e1e1f in wet_shell_init ../../git/weston/tests/weston-test-desktop-shell.c:224
#5 0x7fb44775fddd in wet_load_shell ../../git/weston/compositor/main.c:956
#6 0x7fb447770db1 in wet_main ../../git/weston/compositor/main.c:3434
#7 0x56172c599279 in execute_compositor ../../git/weston/tests/weston-test-fixture-compositor.c:432
#8 0x56172c59cce5 in weston_test_harness_execute_as_client ../../git/weston/tests/weston-test-runner.c:528
#9 0x56172c58dc8c in fixture_setup ../../git/weston/tests/alpha-blending-test.c:65
#10 0x56172c58dd31 in fixture_setup_run_ ../../git/weston/tests/alpha-blending-test.c:67
#11 0x56172c59d29a in main ../../git/weston/tests/weston-test-runner.c:661
#12 0x7fb4473d509a in __libc_start_main ../csu/libc-start.c:308
Indirect leak of 144 byte(s) in 2 object(s) allocated from:
#0 0x7fb447880518 in calloc (/lib/x86_64-linux-gnu/libasan.so.5+0xe9518)
#1 0x7fb4432bb592 in zalloc ../../git/weston/include/libweston/zalloc.h:38
#2 0x7fb4432bb882 in weston_desktop_client_create ../../git/weston/libweston-desktop/client.c:108
#3 0x7fb4432c2d0e in weston_desktop_xwayland_init ../../git/weston/libweston-desktop/xwayland.c:415
#4 0x7fb4432baadf in weston_desktop_create ../../git/weston/libweston-desktop/libweston-desktop.c:87
#5 0x7fb4432e1e1f in wet_shell_init ../../git/weston/tests/weston-test-desktop-shell.c:224
#6 0x7fb44775fddd in wet_load_shell ../../git/weston/compositor/main.c:956
#7 0x7fb447770db1 in wet_main ../../git/weston/compositor/main.c:3434
#8 0x56172c599279 in execute_compositor ../../git/weston/tests/weston-test-fixture-compositor.c:432
#9 0x56172c59cce5 in weston_test_harness_execute_as_client ../../git/weston/tests/weston-test-runner.c:528
#10 0x56172c58dc8c in fixture_setup ../../git/weston/tests/alpha-blending-test.c:65
#11 0x56172c58dd31 in fixture_setup_run_ ../../git/weston/tests/alpha-blending-test.c:67
#12 0x56172c59d29a in main ../../git/weston/tests/weston-test-runner.c:661
#13 0x7fb4473d509a in __libc_start_main ../csu/libc-start.c:308
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>