Fix -Wsign-compare warnings

Source/Core/Common/Hash.cpp

@@ -99,7 +99,7 @@ u32 HashEctor(const u8* ptr, size_t length)
 {
   u32 crc = 0;
 
-  for (int i = 0; i < length; i++)
+  for (size_t i = 0; i < length; i++)
   {
     crc ^= ptr[i];
     crc = (crc << 3) | (crc >> 29);

Source/Core/DolphinQt/QtUtils/UTF8CodePointCountValidator.cpp

@@ -6,7 +6,7 @@
 
 #include "Common/StringUtil.h"
 
-UTF8CodePointCountValidator::UTF8CodePointCountValidator(int max_count, QObject* parent)
+UTF8CodePointCountValidator::UTF8CodePointCountValidator(std::size_t max_count, QObject* parent)
     : QValidator(parent), m_max_count(max_count)
 {
 }

Source/Core/DolphinQt/QtUtils/UTF8CodePointCountValidator.h

@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include <cstddef>
+
 #include <QString>
 #include <QValidator>
 
@@ -11,9 +13,10 @@ class UTF8CodePointCountValidator : public QValidator
 {
   Q_OBJECT
 public:
-  explicit UTF8CodePointCountValidator(int max_count, QObject* parent = nullptr);
+  explicit UTF8CodePointCountValidator(std::size_t max_count, QObject* parent = nullptr);
 
   QValidator::State validate(QString& input, int& pos) const override;
 
-  int m_max_count;
+private:
+  std::size_t m_max_count;
 };

Source/Core/DolphinQt/TAS/TASCheckBox.cpp

@@ -20,7 +20,7 @@ bool TASCheckBox::GetValue() const
   if (checkState() == Qt::PartiallyChecked)
   {
     const u64 frames_elapsed = Movie::GetCurrentFrame() - m_frame_turbo_started;
-    return frames_elapsed % m_turbo_total_frames < m_turbo_press_frames;
+    return static_cast<int>(frames_elapsed % m_turbo_total_frames) < m_turbo_press_frames;
   }
 
   return isChecked();