Prefer zero initializer over memset

Created using following semantic patch and Coccinelle:

@@
type T;
identifier tmp;
@@
- T tmp;
+ T tmp = { 0 };
- memset(&tmp, 0, sizeof(T));
Cacorrect IOP: prevent crashes in legacy presets update infrastructure
Colormapping IOP: prevent crashes in legacy presets update infrastructure

memset's are not needed. I checked that (at least when using C99 initialization), everything is zero-initialized by default.
Demosaic IOP: prevent crashes in legacy presets update infrastructure
Flip IOP: prevent crashes in legacy presets update infrastructure
Highlights IOP: prevent crashes in legacy presets update infrastructure
Rawdenoise IOP: prevent crashes in legacy presets update infrastructure
Temperature IOP: prevent crashes in legacy presets update infrastructure