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mem_host_flags: check returned pointer for NULL (#1924)
The specification states that `clEnqueueMapImage` and `clEnqueueMapBuffer` should return NULL on error. Ensure this is checked. This testing gap was caught by a compiler warning about `dataPtr` being written but not read. With this fix, there are no more Wunused-but-set-variable warnings in this test, so reenable the warning. Signed-off-by: Sven van Haastregt <sven.vanhaastregt@arm.com>
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