Make sure the getsfunc_*() functions used by ap_scan_script_header_err*()

NUL-terminate the resulting string, even in case of an error. mod_cgi
and mod_cgid try to log incomplete output from CGI scripts.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1244211 13f79535-47bb-0310-9956-ffa450edef68