test: Restore test behaviour on failure

A recent change makes test continue to run after failure. This results in
a lot of useless output and may lead to a segfault. Fix this by adding
back the 'return' statement.

Fixes: fa847bb409d ("test: Wrap assert macros in ({ ... }) and fix")

Signed-off-by: Simon Glass <sjg@chromium.org>
1 file changed