common/iobuf.c: Add some sanity checks to catch programmer bugs.
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Description

common/iobuf.c: Add some sanity checks to catch programmer bugs.

* common/iobuf.c (iobuf_alloc): Check that BUFSIZE is not 0.
(iobuf_readbyte): Check that A is an input filter.  Check that the
amount of read data is at most the amount of buffered data.
(iobuf_read): Check that A is an input filter.
(iobuf_writebyte): Check that A is not an input filter.
(iobuf_writestr): Check that A is not an input filter.
(iobuf_flush_temp): Check that A is not an input filter.