LU-16634 misc: remove unnecessary ioctl typecasts

LU-16634 misc: remove unnecessary ioctl typecasts

Declare "void __user *uarg" in the ioctl handling code so
that it isn't typecast on every access in the ioctl handler.
Unnecessary typecast risks hiding compiler warnings and bugs.

Convert indentation to tabs for lines previously using spaces.
Change local variable declarations to use only a single space.

Test-Parameters: trivial
Change-Id: I1a0d2f839949debf346aa15c65b0f407e1ce7057
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50333
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>