Seg. fault on Linux

src/fen.c

@@ -6,7 +6,7 @@ void fen_toBoard(const FEN fen, Board board) {
   char fen_char;
   uint row = 8;
   uint column = 0;
-  uint board_i;
+  uint board_i = 0;
   while ((fen_char = fen[i++]) != 0) {
     if (fen_char == '/') {
       row--;

src/main.c

@@ -6,5 +6,6 @@ int main() {
   fen_toBoard(fen, board);
   Coordinates *coords = piece_getMoves(board, board[2].piece, board[2].coords);
   printf("%d,%d", coords->row, coords->column);
+  free(coords);
   return 0;
 }