After hitting control-C when writing a wav file, dahdi_monitor reports
"Failed to read in a full wav header. Expect bad things."

Also when using the -F output option, the wav header is not written.

Reported-by: Richard Miller
Internal-Issue-ID: DAHTOOL-59
Patch: dahdi_monitor.diff by Richard Miller (license #5685)
Signed-off-by: Russ Meyerriecks <rmeyerriecks@digium.com>

git-svn-id: http://svn.astersk.org/svn/dahdi/tools/trunk@10717 17933a7a-c749-41c5-a318-cba88f637d49