Fix test script to run also on dash shell

/bin/sh points to dash instead of bash in some linux distros.
One test would fail if dash was used, this fix will allow all tests
to run properly on dash too.

dash built-in printf does not support "\xNN" -hex escape format.
"\NNN" -octal escape format is supported by both bash and dash printf.

Replaced "$(echo "$expect")" because this actually runs /bin/echo
instead of shell internal echo and in some cases causes "\NNN" escapes
to be printed as the actual characters they represent instead of the
escape sequence itself.

Cosmetic quotes added to make printout a bit clearer.

Signed-off-by: Tero Tervala <tero.tervala@unikie.com>
Message-Id: <20220704073722.1075849-1-tero.tervala@unikie.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

tests/run_tests.sh

@@ -195,7 +195,7 @@ asm_to_so_test () {
 run_fdtget_test () {
     expect="$1"
     shift
-    printf "fdtget-runtest.sh %s $*:	" "$(echo $expect)"
+    printf "fdtget-runtest.sh \"%s\" $*:	" "$expect"
     base_run_test sh "$SRCDIR/fdtget-runtest.sh" "$expect" "$@"
 }
 
@@ -862,7 +862,7 @@ fdtget_tests () {
     run_fdtget_test "61 62 63 0" -tbx $dtb /randomnode tricky1
     run_fdtget_test "a b c d de ea ad be ef" -tbx $dtb /randomnode blob
     run_fdtget_test "MyBoardName\0MyBoardFamilyName\0" -tr $dtb / compatible
-    run_fdtget_test "\x0a\x0b\x0c\x0d\xde\xea\xad\xbe\xef" -tr $dtb /randomnode blob
+    run_fdtget_test "\012\013\014\015\336\352\255\276\357" -tr $dtb /randomnode blob
 
     # Here the property size is not a multiple of 4 bytes, so it should fail
     run_wrap_error_test $DTGET -tlx $dtb /randomnode mixed