test/run: Report and return failure

This script runs the tests but does not report failure. Also it always
returns an exit code of 0 even on failure.

Fix these problems by checking the result of each test.

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

test/run

-#!/bin/sh
+#!/bin/bash
+
+run_test() {
+	$@
+	[ $? -ne 0 ] && result=$((result+1))
+	echo "result $result"
+}
 
 # Run all tests that the standard sandbox build can support
-./test/py/test.py --bd sandbox --build
+run_test ./test/py/test.py --bd sandbox --build
 
 # Run tests which require sandbox_spl
-./test/py/test.py --bd sandbox_spl --build -k test/py/tests/test_ofplatdata.py
+run_test ./test/py/test.py --bd sandbox_spl --build -k \
+		test/py/tests/test_ofplatdata.py
 
 # Run tests for the flat DT version of sandbox
 ./test/py/test.py --bd sandbox_flattree --build
+
+if [ $result == 0 ]; then
+	echo "Tests passed!"
+else
+	echo "Tests FAILED"
+	exit 1
+fi