Clean up invocation of fdt{get,put} tests

This patch cleans up how the fdtget and fdtput tests are invoked.
Specifically we no longer hide the full command lines with a wrapper
function - this makes it possible to distinguish fdtget from similar
fdtput tests and makes it easier to work out how to manually invoke an
individual failing test.

In addition, we remove the testing for errors from the
fdt{get,put}-runtest.sh script, instead using an internal wrapper
analagous to run_wrap_test which can test for any program invocation
that's expected to return an error.

For a couple of the fdtput tests this would result in printing out
ludicrously large command lines.  Therefore we introduce a new
mechanism to cut those down to something reasonable.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

tests/fdtput-runtest.sh

@@ -14,7 +14,7 @@ rm -f $LOG $EXPECT
 trap "rm -f $LOG $EXPECT" 0
 
 expect="$1"
-echo "$expect" >$EXPECT
+echo $expect >$EXPECT
 dtb="$2"
 node="$3"
 property="$4"
@@ -23,20 +23,10 @@ shift 5
 value="$@"
 
 # First run fdtput
-verbose_run $VALGRIND "$DTPUT" "$dtb" "$node" "$property" $value $flags
-ret="$?"
-
-if [ "$ret" -ne 0 -a "$expect" = "ERR" ]; then
-	PASS
-fi
-
-FAIL_IF_SIGNAL $ret
+verbose_run_check $VALGRIND "$DTPUT" "$dtb" "$node" "$property" $value $flags
 
 # Now fdtget to read the value
-verbose_run_log "$LOG" $VALGRIND "$DTGET" "$dtb" "$node" "$property" $flags
-ret="$?"
-
-FAIL_IF_SIGNAL $ret
+verbose_run_log_check "$LOG" $VALGRIND "$DTGET" "$dtb" "$node" "$property" $flags
 
 diff $EXPECT $LOG
 ret="$?"