msi: source one off error correction

[Aric Stewart]

correct an error where i was not properly advancing a pointer.
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Index: dlls/msi/source.c
===================================================================
RCS file: /home/wine/wine/dlls/msi/source.c,v
retrieving revision 1.2
diff -u -r1.2 source.c
--- dlls/msi/source.c	11 Jul 2005 13:22:24 -0000	1.2
+++ dlls/msi/source.c	11 Jul 2005 15:01:06 -0000
@@ -225,6 +225,7 @@
             rc = RegQueryValueExW(sourcekey, INSTALLPROPERTY_LASTUSEDSOURCEstringW,
                     0, 0, (LPBYTE)buffer,&size); 
             ptr = strchrW(buffer,';');
+            ptr ++;
             ptr = strchrW(ptr,';');
             if (!ptr)
                 rc = ERROR_UNKNOWN_PROPERTY;