vmalloc_min is currently a void pointer, but everywhere its used
contains a cast - either to a void pointer when setting or back to
an integer type when being used. Eliminate these casts by changing
its type to unsigned long.
Reviewed-by: Linus Walleij<linus.walleij@xxxxxxxxxx>
Signed-off-by: Russell King (Oracle)<rmk+kernel@xxxxxxxxxxxxxxx>