KVM: guest_memfd: Remove redundant kvm_gmem_getattr implementation

Remove the redundant kvm_gmem_getattr() implementation that simply calls
generic_fillattr() without any special handling. The VFS layer
(vfs_getattr_nosec()) will call generic_fillattr() by default when no
custom getattr operation is provided in the inode_operations structure.

This is a cleanup with no functional change.

Signed-off-by: Shivank Garg <shivankg@amd.com>
Reviewed-By: Ackerley Tng <ackerleytng@google.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Link: https://lore.kernel.org/r/20250602172317.10601-1-shivankg@amd.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: shivankgarg98

virt/kvm/guest_memfd.c

@@ -382,23 +382,12 @@ static const struct address_space_operations kvm_gmem_aops = {
 #endif
 };
 
-static int kvm_gmem_getattr(struct mnt_idmap *idmap, const struct path *path,
-			    struct kstat *stat, u32 request_mask,
-			    unsigned int query_flags)
-{
-	struct inode *inode = path->dentry->d_inode;
-
-	generic_fillattr(idmap, request_mask, inode, stat);
-	return 0;
-}
-
 static int kvm_gmem_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 			    struct iattr *attr)
 {
 	return -EINVAL;
 }
 static const struct inode_operations kvm_gmem_iops = {
-	.getattr	= kvm_gmem_getattr,
 	.setattr	= kvm_gmem_setattr,
 };