replace strlen(cpVHostMD5) with MD5_DIGESTSIZE*2 in ssl_hook_pre_connection()

since we know the string returned by ap_md5() will always be that length
PR:
Obtained from:
Submitted by:
Reviewed by:


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92213 13f79535-47bb-0310-9956-ffa450edef68