Fix for bug 81966. Added NR_ShutdownRegistry() to free the registry file for deletion.

r=sgehani, syd, sr=mscott.

xpinstall/cleanup/InstallCleanupMac.cpp

@@ -521,7 +521,7 @@ void main(void)
                     gQuitFlag = true;
                 }
             }
-            
+            NR_RegClose(&reg);
             NR_ShutdownRegistry();
         }
         

xpinstall/cleanup/InstallCleanupUnix.cpp

@@ -98,6 +98,7 @@ int main(int argc,char* argv[])
             } while (status == TRY_LATER);
             NR_RegClose(&reg);
         }
+        NR_ShutdownRegistry();
         unlink(regFilePath);
     }
     return(0);

xpinstall/cleanup/InstallCleanupWin.cpp

@@ -131,6 +131,7 @@ int WINAPI WinMain( HINSTANCE, HINSTANCE, LPSTR args, int)
                 RegDeleteValue(hkRunOnceHandle, cleanupKeyName);
                 NR_RegClose(&reg);
             }
+            NR_ShutdownRegistry();
             DeleteFile(regFilePath);
         }
     }