[Python-3000] Fix sndhdr module for bytes

[Victor Stinner]

Hi,

As imghdr, sndhdr tests were strill based on Unicode strings instead of bytes.

Attached patch should fix the module. I'm very, I was unable to test it.

Note: I replaced aifc.openfp with aifc.open since it's the new public 
function.

sndhdr requires some cleanup: it doesn't check division by zero in functions 
test_hcom and test_voc. I think that division by zero means that the file is 
invalid. I didn't want to fix these bugs in the same patch. So first I'm 
waiting your comments about this one :-)

Victor Stinner
http://hachoir.org/
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