Memleak found by ASAN:
Direct leak of 258 byte(s) in 8 object(s) allocated from:
#0 0x7f3eedb6e817 in __interceptor_strdup (/usr/lib/x86_64-linux-gnu/libasan.so.6+0x57817)
#1 0x55821ce5e6a5 in stream_alloc ../clients/weston-debug.c:94
#2 0x55821ce5e974 in stream_find ../clients/weston-debug.c:128
#3 0x55821ce5eb15 in debug_advertise ../clients/weston-debug.c:157
#4 0x7f3eed7b4d1c (/usr/lib/x86_64-linux-gnu/libffi.so.7+0x6d1c)
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>