Everywhere: Re-format with clang-format-11

Compared to version 10 this fixes a bunch of formatting issues, mostly
around structs/classes with attributes like [[gnu::packed]], and
incorrect insertion of spaces in parameter types ("T &"/"T &&").
I also removed a bunch of // clang-format off/on and FIXME comments that
are no longer relevant - on the other hand it tried to destroy a couple of
neatly formatted comments, so I had to add some as well.

Kernel/Net/ARP.h

@@ -46,8 +46,7 @@ struct ARPHardwareType {
     };
 };
 
-class [[gnu::packed]] ARPPacket
-{
+class [[gnu::packed]] ARPPacket {
 public:
     u16 hardware_type() const { return m_hardware_type; }
     void set_hardware_type(u16 w) { m_hardware_type = w; }

Kernel/Net/E1000NetworkAdapter.cpp

@@ -33,6 +33,7 @@
 
 namespace Kernel {
 
+// clang-format off
 #define REG_CTRL 0x0000
 #define REG_STATUS 0x0008
 #define REG_EEPROM 0x0014
@@ -139,6 +140,7 @@ namespace Kernel {
 #define INTERRUPT_PHYINT (1 << 12)
 #define INTERRUPT_TXD_LOW (1 << 15)
 #define INTERRUPT_SRPD (1 << 16)
+// clang-format on
 
 // https://www.intel.com/content/dam/doc/manual/pci-pci-x-family-gbe-controllers-software-dev-manual.pdf Section 5.2
 static bool is_valid_device_id(u16 device_id)

Kernel/Net/E1000NetworkAdapter.h

@@ -54,8 +54,7 @@ private:
     virtual void handle_irq(const RegisterState&) override;
     virtual const char* class_name() const override { return "E1000NetworkAdapter"; }
 
-    struct [[gnu::packed]] e1000_rx_desc
-    {
+    struct [[gnu::packed]] e1000_rx_desc {
         volatile uint64_t addr { 0 };
         volatile uint16_t length { 0 };
         volatile uint16_t checksum { 0 };
@@ -64,8 +63,7 @@ private:
         volatile uint16_t special { 0 };
     };
 
-    struct [[gnu::packed]] e1000_tx_desc
-    {
+    struct [[gnu::packed]] e1000_tx_desc {
         volatile uint64_t addr { 0 };
         volatile uint16_t length { 0 };
         volatile uint8_t cso { 0 };

Kernel/Net/EthernetFrameHeader.h

@@ -31,8 +31,7 @@
 
 #pragma GCC diagnostic ignored "-Warray-bounds"
 
-class [[gnu::packed]] EthernetFrameHeader
-{
+class [[gnu::packed]] EthernetFrameHeader {
 public:
     EthernetFrameHeader() { }
     ~EthernetFrameHeader() { }

Kernel/Net/ICMP.h

@@ -36,8 +36,7 @@ struct ICMPType {
     };
 };
 
-class [[gnu::packed]] ICMPHeader
-{
+class [[gnu::packed]] ICMPHeader {
 public:
     ICMPHeader() { }
     ~ICMPHeader() { }
@@ -63,8 +62,7 @@ private:
 
 static_assert(sizeof(ICMPHeader) == 4);
 
-struct [[gnu::packed]] ICMPEchoPacket
-{
+struct [[gnu::packed]] ICMPEchoPacket {
     ICMPHeader header;
     NetworkOrdered<u16> identifier;
     NetworkOrdered<u16> sequence_number;

Kernel/Net/IPv4.h

@@ -47,8 +47,7 @@ enum class IPv4PacketFlags : u16 {
 
 NetworkOrdered<u16> internet_checksum(const void*, size_t);
 
-class [[gnu::packed]] IPv4Packet
-{
+class [[gnu::packed]] IPv4Packet {
 public:
     u8 version() const { return (m_version_and_ihl >> 4) & 0xf; }
     void set_version(u8 version) { m_version_and_ihl = (m_version_and_ihl & 0x0f) | (version << 4); }

Kernel/Net/TCP.h

@@ -41,8 +41,7 @@ struct TCPFlags {
     };
 };
 
-class [[gnu::packed]] TCPPacket
-{
+class [[gnu::packed]] TCPPacket {
 public:
     TCPPacket() = default;
     ~TCPPacket() = default;

Kernel/Net/TCPSocket.cpp

@@ -310,8 +310,7 @@ void TCPSocket::receive_tcp_packet(const TCPPacket& packet, u16 size)
 
 NetworkOrdered<u16> TCPSocket::compute_tcp_checksum(const IPv4Address& source, const IPv4Address& destination, const TCPPacket& packet, u16 payload_size)
 {
-    struct [[gnu::packed]] PseudoHeader
-    {
+    struct [[gnu::packed]] PseudoHeader {
         IPv4Address source;
         IPv4Address destination;
         u8 zero;

Kernel/Net/UDP.h

@@ -30,8 +30,7 @@
 
 namespace Kernel {
 
-class [[gnu::packed]] UDPPacket
-{
+class [[gnu::packed]] UDPPacket {
 public:
     UDPPacket() { }
     ~UDPPacket() { }