null pointer passed as argument 2 to memcpy(), which is declared to never be null

[Milan Crha]

	Hi,
while have compiled libical and others with some code sanitizing
options I noticed a runtime error on a console:

> libical/src/libical/icalarray.c:181:9: runtime error: null pointer
> passed as argument 2, which is declared to never be null

That line calls memcpy() unconditionally. The thing is that for the
first time, when the array is empty, the currently allocated chunks are
NULL, hence the runtime warning.

Attached is a trivial patch which fixes it.

You can use realloc() instead, which accepts NULL, but I didn't went
that far.
	Bye,
	Milan
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