even when the player has no Invocations skill.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7523 c06c8d41-db1a-0410-9941-cceddc491573
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const int random_factor = random2(you.skills[SK_INVOCATIONS] * healed / divisor);
const int random_factor = random2(you.skills[SK_INVOCATIONS] * healed /
divisor);
const int random_factor = random2((you.skills[SK_INVOCATIONS] + 1) * healed / divisor);
const int random_factor = random2((you.skills[SK_INVOCATIONS] + 1) *
healed / divisor);