wintrust/tests: Fix a memory leak (valgrind)

[Bruno Jesus]

For bug https://bugs.winehq.org/show_bug.cgi?id=36605
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diff --git a/dlls/wintrust/tests/softpub.c b/dlls/wintrust/tests/softpub.c
index f342936..b1ac8a3 100644
--- a/dlls/wintrust/tests/softpub.c
+++ b/dlls/wintrust/tests/softpub.c
@@ -222,6 +222,7 @@ static void test_utils(SAFE_PROVIDER_FUNCTIONS *funcs)
         }
         else
             skip("CertCreateCertificateContext failed: %08x\n", GetLastError());
+        funcs->pfnFree(data.pasSigners);
     }
 }