fuchsia: Don't print error if ColorBuffer already exists.

If CreateColorBuffer2() returns ZX_ERR_ALREADY_EXISTS,
it means the color buffer has already been created and
the driver didn't need to do anything. This is an expected
behavior and it should not print error messages. Instead we
can just print a debug log.

Change-Id: Iaa4d55085d88e3c3f95f8e75ae56a751e6b1d1c6
1 file changed