Fix: memory leak in naval

src/programs/navalbattle.c

@@ -42,6 +42,9 @@ void program_navalbattle()
 		show_game_stats(grid, enemyGrid);
 	} while (check_victory(grid, enemyGrid) == 0);
 
+	free_grid(grid);
+	free_grid(enemyGrid);
+
 	return;	
 }
 
@@ -52,7 +55,6 @@ void init_battlefield(grid_t* grid[SIZE][SIZE])
 		for (size_t j=0; j<SIZE; j++)
 		{
 			grid[i][j] = (grid_t*)malloc(sizeof(grid_t));
-			serial_printf(3, "malloc'd x=%d y=%d at 0x%x", i, j, grid[i][j]);
 			grid[i][j]->x = i;
 			grid[i][j]->y = j;
 			grid[i][j]->role = 0;
@@ -61,6 +63,18 @@ void init_battlefield(grid_t* grid[SIZE][SIZE])
 	}
 }
 
+// To avoid memory leaks..
+void free_grid(grid_t* grid[SIZE][SIZE])
+{
+	for (size_t i=0; i<SIZE; i++)
+	{
+		for (size_t j=0; j<SIZE; j++)
+		{
+			free(grid[i][j]);
+		}
+	}
+}
+
 void show_ally_battlefield(grid_t* grid[SIZE][SIZE])
 {	
 	puts("\n*** Ally grid ***\n");