AK: Bring AK::Error into the global namespace

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/e5dde37e248

AK/Error.h

@@ -117,4 +117,5 @@ struct Formatter<Error> : Formatter<FormatString> {
 
 }
 
+using AK::Error;
 using AK::ErrorOr;

Userland/Libraries/LibCore/AnonymousBuffer.cpp

@@ -32,7 +32,7 @@ ErrorOr<AnonymousBuffer> AnonymousBuffer::create_with_size(size_t size)
 #if defined(__serenity__)
     fd = anon_create(round_up_to_power_of_two(size, PAGE_SIZE), O_CLOEXEC);
     if (fd < 0)
-        return AK::Error::from_errno(errno);
+        return Error::from_errno(errno);
 #elif defined(__linux__)
     fd = memfd_create("", MFD_CLOEXEC);
     if (fd < 0)
@@ -43,7 +43,7 @@ ErrorOr<AnonymousBuffer> AnonymousBuffer::create_with_size(size_t size)
     }
 #endif
     if (fd < 0)
-        return AK::Error::from_errno(errno);
+        return Error::from_errno(errno);
     return create_from_anon_fd(fd, size);
 }
 
@@ -51,7 +51,7 @@ ErrorOr<NonnullRefPtr<AnonymousBufferImpl>> AnonymousBufferImpl::create(int fd,
 {
     auto* data = mmap(nullptr, round_up_to_power_of_two(size, PAGE_SIZE), PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd, 0);
     if (data == MAP_FAILED)
-        return AK::Error::from_errno(errno);
+        return Error::from_errno(errno);
     return AK::adopt_nonnull_ref_or_enomem(new (nothrow) AnonymousBufferImpl(fd, size, data));
 }
 

Userland/Libraries/LibGfx/Bitmap.cpp

@@ -610,7 +610,7 @@ ShareableBitmap Bitmap::to_shareable_bitmap() const
 ErrorOr<BackingStore> Bitmap::allocate_backing_store(BitmapFormat format, IntSize const& size, int scale_factor)
 {
     if (size_would_overflow(format, size, scale_factor))
-        return AK::Error::from_string_literal("Gfx::Bitmap backing store size overflow"sv);
+        return Error::from_string_literal("Gfx::Bitmap backing store size overflow"sv);
 
     const auto pitch = minimum_pitch(size.width() * scale_factor, format);
     const auto data_size_in_bytes = size_in_bytes(pitch, size.height() * scale_factor);
@@ -623,7 +623,7 @@ ErrorOr<BackingStore> Bitmap::allocate_backing_store(BitmapFormat format, IntSiz
     void* data = mmap(nullptr, data_size_in_bytes, PROT_READ | PROT_WRITE, map_flags, 0, 0);
 #endif
     if (data == MAP_FAILED)
-        return AK::Error::from_errno(errno);
+        return Error::from_errno(errno);
     return BackingStore { data, pitch, data_size_in_bytes };
 }