fix mem leak. pnunn. bugz# 5552.

modules/libimg/gifcom/nsGIFDecoder.cpp

@@ -221,6 +221,8 @@ nsGIFDecFactory::CreateInstance(nsISupports *aOuter,
     *ppv = NULL;
     delete gifdec;
   }
+  delete ic; /* is a place holder */
+
   return res;
 }
  

modules/libimg/jpgcom/nsJPGDecoder.cpp

@@ -224,6 +224,7 @@ nsJPGDecFactory::CreateInstance(nsISupports *aOuter,
     *ppv = NULL;
     delete jpgdec;
   }
+  delete ic; /* is a place holder */
 
   return res;
 }

modules/libimg/pngcom/nsPNGDecoder.cpp

@@ -221,6 +221,8 @@ nsPNGDecFactory::CreateInstance(nsISupports *aOuter,
     *ppv = NULL;
     delete pngdec;
   }
+  delete ic; /* is a place holder */
+
   return res;
 }