Minor fixes for clCopyImage. (#1130)

* Minor fixes for clCopyImage.

Signed-off-by: John Kesapides <john.kesapides@arm.com>
Change-Id: I63c47570e45580e5e29716a46929cb1127711c6b

* Convert comment to CTS style.
Return error code instead of -1 in clFinish.
1 file changed