Kernel: Clean up AC'97 driver code style

* Remove braces from single-line conditionals
* Use aggregate initialization style for member variables

Kernel/Devices/Audio/AC97.cpp

@@ -61,11 +61,10 @@ bool AC97::handle_irq(RegisterState const&)
  pcm_out_status_register.out(pcm_out_status);
 
  // Stop the DMA engine if we're through with the buffer and no one is waiting
- if (is_dma_halted && m_irq_queue.is_empty()) {
+ if (is_dma_halted && m_irq_queue.is_empty())
  reset_pcm_out();
- } else {
+ else
  m_irq_queue.wake_all();
- }
  return true;
 }
 
@@ -187,9 +186,9 @@ ErrorOr<size_t> AC97::write(size_t channel_index, UserOrKernelBuffer const& data
  if (channel_index != 0)
  return Error::from_errno(ENODEV);
 
- if (!m_output_buffer) {
+ if (!m_output_buffer)
  m_output_buffer = TRY(MM.allocate_dma_buffer_pages(m_output_buffer_page_count * PAGE_SIZE, "AC97 Output buffer"sv, Memory::Region::Access::Write));
- }
+
  if (!m_buffer_descriptor_list) {
  size_t buffer_descriptor_list_size = buffer_descriptor_list_max_entries * sizeof(BufferDescriptorListEntry);
  buffer_descriptor_list_size = TRY(Memory::page_round_up(buffer_descriptor_list_size));
@@ -236,9 +235,8 @@ ErrorOr<void> AC97::write_single_buffer(UserOrKernelBuffer const& data, size_t o
  // Copy data from userspace into one of our buffers
  TRY(data.read(m_output_buffer->vaddr_from_page_index(m_output_buffer_page_index).as_ptr(), offset, length));
 
- if (!m_pcm_out_channel.dma_running()) {
+ if (!m_pcm_out_channel.dma_running())
  reset_pcm_out();
- }
 
  // Write the next entry to the buffer descriptor list
  u16 number_of_samples = length / sizeof(u16);
@@ -250,9 +248,8 @@ ErrorOr<void> AC97::write_single_buffer(UserOrKernelBuffer const& data, size_t o
  auto buffer_address = static_cast<u32>(m_buffer_descriptor_list->physical_page(0)->paddr().get());
  m_pcm_out_channel.set_last_valid_index(buffer_address, m_buffer_descriptor_list_index);
 
- if (!m_pcm_out_channel.dma_running()) {
+ if (!m_pcm_out_channel.dma_running())
  m_pcm_out_channel.start_dma();
- }
 
  m_output_buffer_page_index = (m_output_buffer_page_index + 1) % m_output_buffer_page_count;
  m_buffer_descriptor_list_index = (m_buffer_descriptor_list_index + 1) % buffer_descriptor_list_max_entries;

Kernel/Devices/Audio/AC97.h

@@ -135,7 +135,7 @@ class AC97 final
  private:
  IOAddress m_channel_base;
  AC97& m_device;
- bool m_dma_running = false;
+ bool m_dma_running { false };
  StringView m_name;
  };
 
@@ -160,17 +160,17 @@ class AC97 final
  virtual ErrorOr<u32> get_pcm_output_sample_rate(size_t channel_index) override;
 
  OwnPtr<Memory::Region> m_buffer_descriptor_list;
- u8 m_buffer_descriptor_list_index = 0;
- bool m_double_rate_pcm_enabled = false;
+ u8 m_buffer_descriptor_list_index { 0 };
+ bool m_double_rate_pcm_enabled { false };
  IOAddress m_io_mixer_base;
  IOAddress m_io_bus_base;
  WaitQueue m_irq_queue;
  OwnPtr<Memory::Region> m_output_buffer;
- u8 m_output_buffer_page_count = 4;
- u8 m_output_buffer_page_index = 0;
+ u8 m_output_buffer_page_count { 4 };
+ u8 m_output_buffer_page_index { 0 };
  AC97Channel m_pcm_out_channel;
- u32 m_sample_rate = 0;
- bool m_variable_rate_pcm_supported = false;
+ u32 m_sample_rate { 0 };
+ bool m_variable_rate_pcm_supported { false };
  RefPtr<AudioChannel> m_audio_channel;
 };