vk: Print ERROR message only if CreateColorBuffer fails

There is a bug in aosp/1801196 where we print ERROR
message if CreateColorBuffer() returns ZX_OK, which
caused some tests to fail the log level check in
Fuchsia CI/CQ. This change fixes the bug.

Change-Id: I4858bf5f4284531e5bfa4399dc131321d990a65b
1 file changed