Silent a sparse Warning.

cid->ecb->lpszLogData can not be NULL.
It is defined in mod_isapi.h as:
typedef struct EXTENSION_CONTROL_BLOCK {
...
    char           lpszLogData[80];
...

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1717086 13f79535-47bb-0310-9956-ffa450edef68