tests/qtest/ast2700-smc-test: Fix leak

ASAN spotted a leak of the memory used to hold the tmp_path:

Direct leak of 35 byte(s) in 1 object(s) allocated from:
    #0 0x55e29aa96da9 in malloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:69:3
    #1 0x7fe0cfb26518 in g_malloc ../glib/gmem.c:106
    #2 0x7fe0cfb4146e in g_strconcat ../glib/gstrfuncs.c:629
    #3 0x7fe0cfb0a78f in g_get_tmp_name ../glib/gfileutils.c:1742
    #4 0x7fe0cfb0b00b in g_file_open_tmp ../glib/gfileutils.c:1802
    #5 0x55e29ab53961 in test_ast2700_evb ../tests/qtest/ast2700-smc-test.c:20:10
    qemu#6 0x55e29ab53803 in main ../tests/qtest/ast2700-smc-test.c:65:5
    qemu#7 0x7fe0cf7bd24c in __libc_start_main ../csu/libc-start.c:308
    qemu#8 0x55e29a9f7759 in _start ../sysdeps/x86_64/start.S:120

Signed-off-by: Fabiano Rosas <[email protected]>
Reviewed-by: Jamin Lin <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Cédric Le Goater <[email protected]>

Author: Fabiano Rosas

tests/qtest/ast2700-smc-test.c

@@ -67,5 +67,6 @@ int main(int argc, char **argv)
 
     qtest_quit(ast2700_evb_data.s);
     unlink(ast2700_evb_data.tmp_path);
+    g_free(ast2700_evb_data.tmp_path);
     return ret;
 }