quartz: Fix a typo

[Andrew Talbot]

Should fix Coverity CID-348 (dereference before NULL check).
---
Changelog:
    quartz: Fix a typo.

diff -urN a/dlls/quartz/pin.c b/dlls/quartz/pin.c
--- a/dlls/quartz/pin.c	2006-11-13 17:34:37.000000000 +0000
+++ b/dlls/quartz/pin.c	2007-02-02 17:43:02.000000000 +0000
@@ -338,7 +338,7 @@
     TRACE("(%p/%p)->(%p)\n", This, iface, Id);
 
     *Id = CoTaskMemAlloc((strlenW(This->pinInfo.achName) + 1) * sizeof(WCHAR));
-    if (!Id)
+    if (!*Id)
         return E_OUTOFMEMORY;
 
     strcpyW(*Id, This->pinInfo.achName);