Fixed MTP to work with TWRP

tools/testing/selftests/ftrace/samples/fail.tc

@@ -0,0 +1,4 @@
+#!/bin/sh
+# description: failure-case example
+cat non-exist-file
+echo "this is not executed"

tools/testing/selftests/ftrace/samples/pass.tc

@@ -0,0 +1,3 @@
+#!/bin/sh
+# description: pass-case example
+return 0

tools/testing/selftests/ftrace/samples/unresolved.tc

@@ -0,0 +1,4 @@
+#!/bin/sh
+# description: unresolved-case example
+trap exit_unresolved INT
+kill -INT $PID

tools/testing/selftests/ftrace/samples/unsupported.tc

@@ -0,0 +1,3 @@
+#!/bin/sh
+# description: unsupported-case example
+exit_unsupported

tools/testing/selftests/ftrace/samples/untested.tc

@@ -0,0 +1,3 @@
+#!/bin/sh
+# description: untested-case example
+exit_untested

tools/testing/selftests/ftrace/samples/xfail.tc

@@ -0,0 +1,3 @@
+#!/bin/sh
+# description: xfail-case example
+cat non-exist-file || exit_xfail