Fix a cppcheck warning.
'ap_unescape_urlencoded()' suggests that NULL can be passed to 'unescape_url()'. So avoid a potential 'strchr(NULL, ...)' which is an undefined behavior. git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1838270 13f79535-47bb-0310-9956-ffa450edef68
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d1c39f0c
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