If a line didn't end with iswhite() whitespace, cfg_getline would run

off the end of the input string.

PR: 1869, 1909
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80549 13f79535-47bb-0310-9956-ffa450edef68