Fix double free in font loading failure #3854
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The memory is freeed in font_dealloc, doing that again leads to SIGABRT.
Fixes #3853.
Changes proposed in this pull request:
I wanted to add test for this, but the error handling futher is broken as well (the invalid font raises IOError, which is later intepreted as missing file and loader tries to do
os.path.basename
on a file like object), so I ended up fixing the crash only for now.