Fix simple signed/unsigned comparison warning.

suite/browser/src/nsInternetSearchService.cpp

@@ -2659,7 +2659,7 @@ InternetSearchDataSource::GetSearchEngineList(nsFileSpec nativeDir, PRBool check
 				nsAutoString	iconURL;
 				PRInt32		extensionOffset;
 				extensionOffset = uri.RFind(".src", PR_TRUE);
-				if ((extensionOffset >= 0) && (extensionOffset == uri.Length()-4))
+				if ((extensionOffset >= 0) && (extensionOffset == len-4))
 				{
 					nsAutoString	temp;
 

suite/browser/src/nsLocalSearchService.cpp

@@ -454,7 +454,7 @@ LocalSearchDataSource::doMatch(nsIRDFLiteral *literal, char *matchMethod, char *
 	else if (!PL_strcmp(matchMethod, "endswith"))
 	{
 		PRInt32 pos = value.RFind(matchText, PR_TRUE);
-		if ((pos >= 0) && (pos == (value.Length() - PRInt32(strlen(matchText)))))
+		if ((pos >= 0) && (pos == (PRInt32(value.Length()) - PRInt32(strlen(matchText)))))
 			found = PR_TRUE;
 	}
 	else if (!PL_strcmp(matchMethod, "is"))