Fix compiler warnings. Bug 127592, r=hwaara, sr=shaver, a=asa

embedding/components/webbrowserpersist/src/nsWebBrowserPersist.cpp

@@ -675,7 +675,7 @@ NS_IMETHODIMP nsWebBrowserPersist::OnDataAvailable(
         // Read data from the input and write to the output
         char buffer[8192];
         PRUint32 bytesRead;
-        PRBool readError;
+        PRBool readError = PR_TRUE;
         while (!cancel && bytesRemaining)
         {
             readError = PR_TRUE;

uriloader/exthandler/nsExternalHelperAppService.cpp

@@ -1182,7 +1182,7 @@ NS_IMETHODIMP nsExternalAppHandler::OnDataAvailable(nsIRequest *request, nsISupp
     PRUint32 numBytesRead = 0; 
     PRUint32 numBytesWritten = 0;
     mProgress += count;
-    PRBool readError;
+    PRBool readError = PR_TRUE;
     while (NS_SUCCEEDED(rv) && count > 0) // while we still have bytes to copy...
     {
       readError = PR_TRUE;