This patch fixes a bug introduced in
rB74188e65028d268af887ab2140e4253087410c1e.
The commit incorrectly moved the declaration and intialization of the
variable `pwr` inside the loop. Since the value was originally modified
in each iteration based on it's previous value and `pwHL` through
`pwr *= pwHL`, this change in scope was wrong. It resetted the value in
each iteration. This patch moves the declaration of `pwr` outside the
loop again.
Reviewed By: JacquesLucke
Differential Revision: https://developer.blender.org/D10258
4a80c0e275