Staging: qlge: Rewrite two while loops as simple for loops

This is a task from the TODO list of qlge driver:
 - some "while" loops could be rewritten with simple "for"

The change is in functions ql_wait_reg_rdy and ql_wait_cfg in qlge_main.c.
The while loops are basically count based
(they decrement on each iteration),
and it makes more sense to be a for loop construction instead.

Signed-off-by: Samuil Ivanov <samuil.ivanovbg@gmail.com>
Link: https://lore.kernel.org/r/20191023205855.GA1841@samuil-ThinkCentre-M92P


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>