tests/audiomatch: add free to make static analysis tools happy

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>

tests/audiomatch.c

@@ -82,9 +82,9 @@ int main(int argc, char **argv) {
     signal = malloc(siglen * sizeof(*signal));
 
     if (fread(data  , 1, datlen, f[0]) != datlen)
-        return 1;
+        goto read_fail;
     if (fread(signal, 1, siglen, f[1]) != siglen)
-        return 1;
+        goto read_fail;
     datlen /= 2;
     siglen /= 2;
 
@@ -111,5 +111,12 @@ int main(int argc, char **argv) {
     }
     printf("presig: %d postsig:%d c:%7.4f lenerr:%d\n", bestpos, datlen - siglen - bestpos, bestc / sigamp, datlen - siglen);
 
+    free(data);
+    free(signal);
     return 0;
+
+read_fail:
+    free(data);
+    free(signal);
+    return 1;
 }