sedispatch: check read_size

Petr Lautrbachrequested to merge
sedispatch_read_size into main

Check read_size to ensure it was a positive number. On receiving a signal, read will return -1 and that will cause big problems for auparse_feed.

Fixes commit 46369d08 ("sedispatch: improve performance")

Author: Steve Grubb sgrubb@redhat.com

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