Kernel+LibC+LibCore: Pass fcntl extra argument as pointer-sized variable

The extra argument to fcntl is a pointer in the case of F_GETLK/F_SETLK
and we were pulling out a u32, leading to pointer truncation on x86_64.
Among other things, this fixes Assistant on x86_64 :^)

2 files changed, 2 insertions, 2 deletions

diff --git a/Userland/Libraries/LibC/fcntl.cpp b/Userland/Libraries/LibC/fcntl.cpp
index 4a421178d0..e67a82d357 100644
--- a/Userland/Libraries/LibC/fcntl.cpp
+++ b/Userland/Libraries/LibC/fcntl.cpp
@@ -19,7 +19,7 @@ int fcntl(int fd, int cmd, ...)
 {
     va_list ap;
     va_start(ap, cmd);
-    u32 extra_arg = va_arg(ap, u32);
+    uintptr_t extra_arg = va_arg(ap, uintptr_t);
     int rc = syscall(SC_fcntl, fd, cmd, extra_arg);
     va_end(ap);
     __RETURN_WITH_ERRNO(rc, rc, -1);
diff --git a/Userland/Libraries/LibCore/System.cpp b/Userland/Libraries/LibCore/System.cpp
index ea5ac7215c..bf48e871a8 100644
--- a/Userland/Libraries/LibCore/System.cpp
+++ b/Userland/Libraries/LibCore/System.cpp
@@ -248,7 +248,7 @@ ErrorOr<int> fcntl(int fd, int command, ...)
 {
     va_list ap;
     va_start(ap, command);
-    u32 extra_arg = va_arg(ap, u32);
+    uintptr_t extra_arg = va_arg(ap, uintptr_t);
     int rc = ::fcntl(fd, command, extra_arg);
     va_end(ap);
     if (rc < 0)