Fix InventoryUtils.count() actually counting slots instead of items

src/main/java/net/wurstclient/util/InventoryUtils.java

@@ -101,6 +101,9 @@ public static int count(Predicate<ItemStack> predicate, int maxInvSlot)
 	 * Counts the number of items in the player's inventory that match the given
 	 * predicate, searching from slot 0 to {@code maxInvSlot-1}.
 	 *
+	 * <p>
+	 * Note: Attempting to count empty slots will always return 0.
+	 *
 	 * @param predicate
 	 *            checks if an item should be counted
 	 * @param maxInvSlot
@@ -114,8 +117,10 @@ public static int count(Predicate<ItemStack> predicate, int maxInvSlot)
 	public static int count(Predicate<ItemStack> predicate, int maxInvSlot,
 		boolean includeOffhand)
 	{
-		return (int)getMatchingSlots(predicate, maxInvSlot, includeOffhand)
-			.count();
+		PlayerInventory inventory = MC.player.getInventory();
+
+		return getMatchingSlots(predicate, maxInvSlot, includeOffhand)
+			.map(slot -> inventory.getStack(slot).getCount()).sum();
 	}
 
 	private static IntStream getMatchingSlots(Predicate<ItemStack> predicate,