ciolib_puttext: free() is not reachable

As far as I can tell, this free() in ciolib_puttext() is not reachable
given the current logic in the function; and, the value of buf is not
modified by any called functions.

Also, this function is invoked with stack allocated buffers, so it
isn't safe to assume a free() is valid in this context. Better to let
the owner of the buffer manage the lifecycle.
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