[PATCH] tests: fix a memory in test_socket_unix_abstract_good

[Li Qiang]

After build qemu with '-fsanitize=address' extra-cflags,
'make check' show following leak:

=================================================================
==44580==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 2500 byte(s) in 1 object(s) allocated from:
    #0 0x7f1b5a8b8d28 in __interceptor_calloc 
(/usr/lib/x86_64-linux-gnu/libasan.so.4+0xded28)
    #1 0x7f1b5a514b10 in g_malloc0 
(/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x51b10)
    #2 0xd79ea4e4c0ad31c3  (<unknown module>)

SUMMARY: AddressSanitizer: 2500 byte(s) leaked in 1 allocation(s).

Call 'g_rand_free' in the end of function to avoid this.

Fixes: 4d3a329af59("tests/util-sockets: add abstract unix socket cases")
Signed-off-by: Li Qiang <liq3ea@163.com>
---
 tests/test-util-sockets.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/test-util-sockets.c b/tests/test-util-sockets.c
index 2ca1e99f17..ca6671f9bf 100644
--- a/tests/test-util-sockets.c
+++ b/tests/test-util-sockets.c
@@ -312,6 +312,7 @@ static void test_socket_unix_abstract_good(void)
     g_thread_join(serv);
 
     g_free(abstract_sock_name);
+    g_rand_free(r);
 }
 #endif
 
-- 
2.17.1