Fix: make b-test exit code

b-test was not exiting with error when cmake invocation failed or
returned an error.
This change makes b-test fail with an error if cmake fails.

Change-Id: I13de6fcf49e99a6d88b44bbc2901323c56bcc2d5
Signed-off-by: Gyorgy Szing <Gyorgy.Szing@arm.com>
1 file changed