Fix: action error query: leak of action path

Fix: action error query: leak of action path

==1429021==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 8 byte(s) in 1 object(s) allocated from:
    #0 0x7fe305f031b2 in __interceptor_realloc /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:164
    #1 0x559f1b022238 in lttng_dynamic_buffer_set_capacity(lttng_dynamic_buffer*, unsigned long) /home/jgalar/EfficiOS/src/lttng-tools/src/common/dynamic-buffer.cpp:159
    #2 0x559f1b021d9f in lttng_dynamic_buffer_append(lttng_dynamic_buffer*, void const*, unsigned long) /home/jgalar/EfficiOS/src/lttng-tools/src/common/dynamic-buffer.cpp:52
    #3 0x559f1b02144a in lttng_dynamic_array_add_element(lttng_dynamic_array*, void const*) /home/jgalar/EfficiOS/src/lttng-tools/src/common/dynamic-array.cpp:58
    #4 0x559f1b07d07b in lttng_action_path_copy(lttng_action_path const*, lttng_action_path*) actions/path.cpp:116
    #5 0x559f1b02383f in lttng_error_query_action_create /home/jgalar/EfficiOS/src/lttng-tools/src/common/error-query.cpp:232
    #6 0x559f1b02760e in lttng_error_query_create_from_payload(lttng_payload_view*, lttng_error_query**) /home/jgalar/EfficiOS/src/lttng-tools/src/common/error-query.cpp:911
    #7 0x559f1af5c361 in receive_lttng_error_query /home/jgalar/EfficiOS/src/lttng-tools/src/bin/lttng-sessiond/client.cpp:740
    #8 0x559f1af64eba in process_client_msg /home/jgalar/EfficiOS/src/lttng-tools/src/bin/lttng-sessiond/client.cpp:2336
    #9 0x559f1af67378 in thread_manage_clients /home/jgalar/EfficiOS/src/lttng-tools/src/bin/lttng-sessiond/client.cpp:2624
    #10 0x559f1af50642 in launch_thread /home/jgalar/EfficiOS/src/lttng-tools/src/bin/lttng-sessiond/thread.cpp:68
    #11 0x7fe3055225c1 in start_thread (/usr/lib/libc.so.6+0x8d5c1)

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I7a6f7d2a9746124581eebf30877466f16db67a6b