First error fixing in createMatrix()

matrix.c

@@ -10,6 +10,9 @@ Matrix createMatrix(unsigned int rows, unsigned int cols)
     Matrix newMatrix;
 	newMatrix.rows = rows;
 	newMatrix.cols = cols;
+	if (rows == 0 || cols == 0)
+		newMatrix.buffer = NULL;
+	else
 		newMatrix.buffer = calloc(rows*cols, sizeof(MatrixType));
 	return newMatrix;
 }