fix fix r9633. fullMatrix::resize re-allocates proxies even if size matches.

Numeric/fullMatrix.cpp

@@ -297,7 +297,8 @@ bool fullMatrix<double>::invert(fullMatrix<double> &result) const
 {
   int M = size1(), N = size2(), lda = size1(), info;
   int *ipiv = new int[std::min(M, N)];
-  result.resize(M,N,false);
+  if (result._own_data)
+    result.resize(M,N,false);
   result.setAll(*this);
   F77NAME(dgetrf)(&M, &N, result._data, &lda, ipiv, &info);
   if(info == 0){