qcap: Fix a mem leak on an error path. Found by Smatch.
diff --git a/dlls/qcap/vfwcapture.c b/dlls/qcap/vfwcapture.c
index b461054..5e46335 100644
--- a/dlls/qcap/vfwcapture.c
+++ b/dlls/qcap/vfwcapture.c
@@ -767,6 +767,8 @@
         *ppPin = (IPin *)(&pPinImpl->pin.pin.lpVtbl);
         return S_OK;
     }
+
+    CoTaskMemFree(pPinImpl);
     return E_FAIL;
 }