tests/strbuf: call va_end for varargs

Summary: CID 1400792

Reviewers: brunobelo

Reviewed By: brunobelo

Subscribers: brunobelo, cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D10204

src/tests/eina/eina_test_strbuf.c

@@ -562,6 +562,7 @@ test_prepend(Eina_Strbuf *buf, ...)
 
    va_start(ap, buf);
    str = test_prepend_vprintf(buf, "%s %s %s %s", ap);
+   va_end(ap);
    return str;
 }