temporarily reverted fix for "error case of opcode CALLMS" of  rev. 7363 to fix keyring in BG Keyring mod until Marzo can take a closer look

git-svn-id: https://exult.svn.sourceforge.net/svnroot/exult/exult/trunk@7373 67c084eb-e78b-48f3-b8e7-bfa43f95ef20