mm/gup: clean up codes in fault_in_xxx() functions

The code style in fault_in_readable() and fault_in_writable() is a little
inconsistent with fault_in_safe_writeable().  In fault_in_readable() and
fault_in_writable(), it uses 'uaddr' passed in as loop cursor.  While in
fault_in_safe_writeable(), local variable 'start' is used as loop cursor. 
This may mislead people when reading code or making change in these codes.

Here define explicit loop cursor and use for loop to simplify codes in
these three functions.  These cleanup can make them be consistent in code
style and improve readability.

[bhe@redhat.com: address minor concerns from David]
  Link: https://lkml.kernel.org/r/Z/sbv3EmLXWgEE7+@MiWiFi-R3L-srv
Link: https://lkml.kernel.org/r/20250410035717.473207-5-bhe@redhat.com


Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Yanjun.Zhu <yanjun.zhu@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>