regex: re_search etc. should return -2 when memory exhausted This bug was uncovered when testing 'grep'. Without the fix, re_search and friends return -1 when memory is exhausted, but -1 means no match, and this causes grep to falsely report no-match instead of memory-exhaustion. See <http://sources.redhat.com/bugzilla/show_bug.cgi?id=13762>. * lib/regexec.c (re_search_stub): Return -2 (not -1) if there is trouble; this can occur if re_search_internal ran out of memory.