Kernel: Use MUST + Vector::try_append instead of Vector::append

In preparation for making Vector::append unavailable during
compilation of the Kernel.

Kernel/FileSystem/Ext2FileSystem.cpp

@@ -709,14 +709,14 @@ void Ext2FS::flush_writes()
             //       to not exist, we remember the fact that it doesn't exist by caching a nullptr.
             //       This seems like a reasonable time to uncache ideas about unknown inodes, so do that.
             if (!it.value) {
-                unused_inodes.append(it.key);
+                MUST(unused_inodes.try_append(it.key));
                 continue;
             }
             if (it.value->ref_count() != 1)
                 continue;
             if (it.value->has_watchers())
                 continue;
-            unused_inodes.append(it.key);
+            MUST(unused_inodes.try_append(it.key));
         }
         for (auto index : unused_inodes)
             uncache_inode(index);

Kernel/Firmware/MultiProcessor/Parser.cpp

@@ -55,14 +55,14 @@ UNMAP_AFTER_INIT void MultiProcessorParser::parse_configuration_table()
             entry = (MultiProcessor::EntryHeader*)(FlatPtr)entry + sizeof(MultiProcessor::ProcessorEntry);
             break;
         case ((u8)MultiProcessor::ConfigurationTableEntryType::Bus):
-            m_bus_entries.append(*(const MultiProcessor::BusEntry*)entry);
+            MUST(m_bus_entries.try_append(*(const MultiProcessor::BusEntry*)entry));
             entry = (MultiProcessor::EntryHeader*)(FlatPtr)entry + sizeof(MultiProcessor::BusEntry);
             break;
         case ((u8)MultiProcessor::ConfigurationTableEntryType::IOAPIC):
             entry = (MultiProcessor::EntryHeader*)(FlatPtr)entry + sizeof(MultiProcessor::IOAPICEntry);
             break;
         case ((u8)MultiProcessor::ConfigurationTableEntryType::IO_Interrupt_Assignment):
-            m_io_interrupt_assignment_entries.append(*(const MultiProcessor::IOInterruptAssignmentEntry*)entry);
+            MUST(m_io_interrupt_assignment_entries.try_append(*(const MultiProcessor::IOInterruptAssignmentEntry*)entry));
             entry = (MultiProcessor::EntryHeader*)(FlatPtr)entry + sizeof(MultiProcessor::IOInterruptAssignmentEntry);
             break;
         case ((u8)MultiProcessor::ConfigurationTableEntryType::Local_Interrupt_Assignment):

Kernel/Graphics/VirtIOGPU/FramebufferDevice.cpp

@@ -170,7 +170,7 @@ ErrorOr<void> FramebufferDevice::create_framebuffer()
 
     NonnullRefPtrVector<Memory::PhysicalPage> pages;
     for (auto i = 0u; i < num_needed_pages; ++i) {
-        pages.append(write_sink_page);
+        TRY(pages.try_append(write_sink_page));
     }
     m_framebuffer_sink_vmobject = TRY(Memory::AnonymousVMObject::try_create_with_physical_pages(pages.span()));
 

Kernel/Net/NetworkTask.cpp

@@ -319,7 +319,7 @@ void flush_delayed_tcp_acks()
     for (auto& socket : *delayed_ack_sockets) {
         MutexLocker locker(socket->mutex());
         if (socket->should_delay_next_ack()) {
-            remaining_sockets.append(socket);
+            MUST(remaining_sockets.try_append(socket));
             continue;
         }
         [[maybe_unused]] auto result = socket->send_ack();

Kernel/Storage/StorageManagement.cpp

@@ -125,8 +125,8 @@ UNMAP_AFTER_INIT void StorageManagement::enumerate_disk_partitions() const
                 continue;
             // FIXME: Try to not hardcode a maximum of 16 partitions per drive!
             auto disk_partition = DiskPartition::create(const_cast<StorageDevice&>(device), (partition_index + (16 * device_index)), partition_metadata.value());
-            partitions.append(disk_partition);
-            const_cast<StorageDevice&>(device).m_partitions.append(disk_partition);
+            MUST(partitions.try_append(disk_partition));
+            MUST(const_cast<StorageDevice&>(device).m_partitions.try_append(disk_partition));
         }
         device_index++;
     }