travis-ci: use correct exit code on errors
The phrase "if [ $? -ne 0 ]; then exit $?; fi" doesn't work correctly; by the time the "exit" statement runs, $? has already been over-written by the result of the [ command. Fix this by explicitly storing $? and then using that stored value in both the test and the error-case exit statement. This change also converts from textual comparison to integer comparison, since the exit code is an integer and there's no need to convert it to a string for comparison. Signed-off-by: NStephen Warren <swarren@nvidia.com> Reviewed-by: NHeiko Schocher <hs@denx.de>
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