hb-font: Fix a potentially undefined use of memcmp() #413
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While it’s fine to call memcmp(x, 0, 0) in practice, the C99 standard
explicitly says that this is not allowed: even if the length is zero,
the pointer arguments must be valid.
http://stackoverflow.com/a/16363034
Coverity ID: 141178
Signed-off-by: Philip Withnall withnall@endlessm.com