Add assertion to ns{C}String::Adopt. r=/sr=mozbot

git-svn-id: svn://10.0.0.236/trunk@111232 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/string/obsolete/nsString2.cpp

@@ -867,6 +867,7 @@ void nsString::InsertWithConversion(const char* aCString,PRUint32 anOffset,PRInt
 }
 
 void nsString::Adopt(PRUnichar* aPtr, PRInt32 aLength) {
+  NS_ASSERTION(aPtr, "Can't adopt |0|");
   nsStr::Destroy(*this);
   if (aLength == -1)
     aLength = nsCharTraits<PRUnichar>::length(aPtr);