[cairo] A couple of valgrind warning fixes

[Chris Wilson]

valgrind issued a warning for the gcc-emitted memcpy for the struct
assignment within cairo-suface.c - I'm sure this has been discussed and
worked around on list before. Perhaps I'm thinking of the matrix copies?
Anyway the first patch, checks that the src!=dst before performing the
copy.

The second patch addresses an off-by-one within the convolution code in
lpyramid.c. The code subtracts one too many from the reflected index and
triggers a valgrind warning when it accesses elements before the start
of the array.

--
Chris Wilson.
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