treewide: use get_random_u32_below() instead of deprecated function

This is a simple mechanical transformation done by:

@@
expression E;
@@
- prandom_u32_max
+ get_random_u32_below
  (E)

Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs
Reviewed-by: SeongJae Park <sj@kernel.org> # for damon
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> # for infiniband
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> # for arm
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # for mmc
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

include/linux/nodemask.h

@@ -516,7 +516,7 @@ static inline int node_random(const nodemask_t *maskp)
 		bit = first_node(*maskp);
 		break;
 	default:
-		bit = find_nth_bit(maskp->bits, MAX_NUMNODES, prandom_u32_max(w));
+		bit = find_nth_bit(maskp->bits, MAX_NUMNODES, get_random_u32_below(w));
 		break;
 	}
 	return bit;