2 silly bugs. First of all, make the code match the error log

(and allow 8192 to be valid). Secondly, this missplaced else
made the size part (8192) non-optional for shm:
PR:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97281 13f79535-47bb-0310-9956-ffa450edef68