Kernel: Don't return -EFOO when return type is KResultOr<...>

Kernel/FileSystem/FIFO.cpp

@@ -155,8 +155,9 @@ KResultOr<size_t> FIFO::write(FileDescription&, size_t, const UserOrKernelBuffer
 {
     if (!m_readers) {
         Thread::current()->send_signal(SIGPIPE, Process::current());
-        return -EPIPE;
+        return EPIPE;
     }
+
     return m_buffer.write(buffer, size);
 }
 

Kernel/FileSystem/Inode.h

@@ -85,7 +85,7 @@ public:
     virtual KResult truncate(u64) { return KSuccess; }
     virtual KResultOr<NonnullRefPtr<Custody>> resolve_as_link(Custody& base, RefPtr<Custody>* out_parent, int options, int symlink_recursion_level) const;
 
-    virtual KResultOr<int> get_block_address(int) { return -ENOTSUP; }
+    virtual KResultOr<int> get_block_address(int) { return ENOTSUP; }
 
     LocalSocket* socket() { return m_socket.ptr(); }
     const LocalSocket* socket() const { return m_socket.ptr(); }

Kernel/Net/Socket.cpp

@@ -254,7 +254,7 @@ KResultOr<size_t> Socket::read(FileDescription& description, size_t, UserOrKerne
 KResultOr<size_t> Socket::write(FileDescription& description, size_t, const UserOrKernelBuffer& data, size_t size)
 {
     if (is_shut_down_for_writing())
-        return -EPIPE;
+        return EPIPE;
     return sendto(description, data, size, 0, {}, 0);
 }
 

Kernel/Syscall.cpp

@@ -131,12 +131,12 @@ KResultOr<FlatPtr> handle(RegisterState& regs, FlatPtr function, FlatPtr arg1, F
 
     if (function >= Function::__Count) {
         dbgln("Unknown syscall {} requested ({:08x}, {:08x}, {:08x})", function, arg1, arg2, arg3);
-        return -ENOSYS;
+        return ENOSYS;
     }
 
     if (s_syscall_table[function] == nullptr) {
         dbgln("Null syscall {} requested, you probably need to rebuild this program!", function);
-        return -ENOSYS;
+        return ENOSYS;
     }
     return (process.*(s_syscall_table[function]))(arg1, arg2, arg3);
 }

Kernel/Syscalls/clock.cpp

@@ -75,7 +75,7 @@ KResultOr<int> Process::sys$clock_nanosleep(Userspace<const Syscall::SC_clock_na
 
     Optional<Time> requested_sleep = copy_time_from_user(params.requested_sleep);
     if (!requested_sleep.has_value())
-        return -EFAULT;
+        return EFAULT;
 
     bool is_absolute;
     switch (params.flags) {