proc: remove mark_inode_dirty() in .setattr()

procfs' .setattr() has updated i_uid, i_gid and i_mode into proc dirent,
we don't need to call mark_inode_dirty() for delayed update, remove it.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Chao Yu <[e-mail]>
Reviewed-by: Alexey Dobriyan <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

fs/proc/base.c

···
 		return error;
 
 	setattr_copy(&nop_mnt_idmap, inode, attr);
-	mark_inode_dirty(inode);
 	return 0;
 }
 

fs/proc/generic.c

···
 		return error;
 
 	setattr_copy(&nop_mnt_idmap, inode, iattr);
-	mark_inode_dirty(inode);
 
 	proc_set_user(de, inode->i_uid, inode->i_gid);
 	de->mode = inode->i_mode;

fs/proc/proc_sysctl.c

···
 		return error;
 
 	setattr_copy(&nop_mnt_idmap, inode, attr);
-	mark_inode_dirty(inode);
 	return 0;
 }