Backports: r1621419 (protocol.c only)

Submitted by: jailletc36
Fix sscanf format spotted by cppcheck 
(changes version major/minor types from signed to unsigned)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x-merge-http-strict@1775717 13f79535-47bb-0310-9956-ffa450edef68