Fix a couple of compilation warnings

Source/items.cpp

@@ -6,7 +6,6 @@
 #include "items.h"
 
 #include <algorithm>
-#include <bitset>
 #ifdef _DEBUG
 #include <random>
 #endif
@@ -1442,8 +1441,6 @@ _item_indexes RndTypeItems(ItemType itemType, int imid, int lvl)
 
 _unique_items CheckUnique(Item &item, int lvl, int uper, int uidOffset = 0)
 {
-	std::bitset<128> uok = {};
-
 	if (GenerateRnd(100) > uper)
 		return UITEM_INVALID;
 
@@ -1462,11 +1459,11 @@ _unique_items CheckUnique(Item &item, int lvl, int uper, int uidOffset = 0)
 	DiscardRandomValues(1);
 
 	// Check if uidOffset is out of bounds
-	if (uidOffset >= validUniques.size()) {
+	if (static_cast<size_t>(uidOffset) >= validUniques.size()) {
 		return UITEM_INVALID;
 	}
 
-	uint8_t selectedUniqueIndex = validUniques[validUniques.size() - 1 - uidOffset];
+	const uint8_t selectedUniqueIndex = validUniques[validUniques.size() - 1 - uidOffset];
 
 	return static_cast<_unique_items>(selectedUniqueIndex);
 }
@@ -3363,7 +3360,7 @@ void TryRandomUniqueItem(Item &item, _item_indexes idx, int8_t mLevel, int uper,
 	}
 
 	// Amount to decrease the final uid by in CheckUnique() to get the desired unique.
-	const int uidOffset = static_cast<int>(std::count_if(UniqueItems.begin() + uid + 1, UniqueItems.end(), [&uniqueItem](UniqueItem &potentialMatch) {
+	const auto uidOffset = static_cast<int>(std::count_if(UniqueItems.begin() + uid + 1, UniqueItems.end(), [&uniqueItem](UniqueItem &potentialMatch) {
 		return uniqueItem.UIItemId == potentialMatch.UIItemId && uniqueItem.UIMinLvl == potentialMatch.UIMinLvl;
 	}));