A close-parenthesis in a guru.dat response string would throw-off the parser

After a negative-match of a Guru expression, we were searching for the next
'(' anywhere in the subsequent chars of the file rather than just the next
line that started with an open-parenthesis character.

This bug was the secondary cause of the buffer-overflow crash addresseed in
commit 62e2280e which was triggered by my recent updates to the guru.dat.