certificate check bug in Makefile.common

[Ville Skyttä]

There appears to be a bug in the certificate check in Makefile.common:

$ make new-sources FILES=lirc-0.8.2pre2.tar.bz2
/bin/sh: line 0: [: lirc-0.8.2pre2.tar.bz2: integer expression expected
[...]

The attached patch should fix it.  Also, I wonder if it'd be better to check 
$HOME/.koji/client.crt instead of ~/.fedora.cert?
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