vm_object: drop unnecessary vm_object.h header

[dougm]

Summary

The header vm_object.h is included in vm_phys.h and uma_core.h, where it is not necessary. Remove it.

[kib]

Did you checked that vm/vm_object.h does not get pulled through any other header? E.g. you can add a temporal fragment like

#ifdef _VM_OBJECT_
#error "vm/vm_object.h still included"
#endif

to these two .c files to be sure.

[dougm]

In D50081#1142343, @kib wrote:

Did you checked that vm/vm_object.h does not get pulled through any other header?

I ran this command:

:src $ grep -r --include=*.[h] vm_object.h .
./sys/compat/linuxkpi/common/include/linux/list.h:#include <vm/vm_object.h>
./sys/compat/linuxkpi/common/include/linux/gfp.h:#include <vm/vm_object.h>
./sys/contrib/openzfs/include/os/freebsd/spl/sys/vnode.h:#include <vm/vm_object.h>
./sys/contrib/openzfs/include/os/freebsd/zfs/sys/zfs_znode_impl.h:#include <vm/vm_object.h>
./sys/dev/drm2/drmP.h:#include <vm/vm_object.h>
./sys/fs/nfs/nfsport.h:#include <vm/vm_object.h>

and concluded that neither of these files was including a file that included vm_object.h.

[markj]

vm_phys.h and uma_core.h

Presumably you meant .c.