Bug 296448 scaled_image leaks if scaled_image->Init() fails

patch by b.jacques@planet.nl r=roc sr=roc a=asa

gfx/src/x11shared/nsXFontAAScaledBitmap.cpp

@@ -414,7 +414,8 @@ nsXFontAAScaledBitmap::GetScaledGreyImage(const char *aChar,
       return PR_FALSE;
     }
     if (!scaled_image->Init()) {
-      NS_ASSERTION(0, "failed to create scaled_image");
+      NS_ASSERTION(0, "failed to initialize scaled_image");
+      delete scaled_image;
       return PR_FALSE;
     }
     scaled_image->SetSize(&glyphMetrics);