Everywhere: Remove redundant inequality comparison operators

C++20 can automatically synthesize `operator!=` from `operator==`, so
there is no point in writing such functions by hand if all they do is
call through to `operator==`.

This fixes a compile error with compilers that implement P2468 (Clang
16 currently). This paper restores the C++17 behavior that if both
`T::operator==(U)` and `T::operator!=(U)` exist, `U == T` won't be
rewritten in reverse to call `T::operator==(U)`. Removing `!=` operators
makes the rewriting possible again.
See https://reviews.llvm.org/D134529#3853062

1 files changed, 0 insertions, 1 deletions

diff --git a/Userland/Libraries/LibDeviceTree/FlattenedDeviceTree.h b/Userland/Libraries/LibDeviceTree/FlattenedDeviceTree.h
index 75b23c6964..053dc73507 100644
--- a/Userland/Libraries/LibDeviceTree/FlattenedDeviceTree.h
+++ b/Userland/Libraries/LibDeviceTree/FlattenedDeviceTree.h
@@ -34,7 +34,6 @@ struct FlattenedDeviceTreeReserveEntry {
     BigEndian<u64> size;
 
     bool operator==(FlattenedDeviceTreeReserveEntry const& other) const { return other.address == address && other.size == size; }
-    bool operator!=(FlattenedDeviceTreeReserveEntry const& other) const { return !(operator==(other)); }
 };
 static_assert(sizeof(FlattenedDeviceTreeReserveEntry) == 16, "FDT Memory Reservation entry size must match specification");