sysreset: Fix unsupported request return values

The description of the sysreset request method in <sysreset.h> says that
the return value should be -EPROTONOSUPPORT if the requested reset type
is not supported by this device.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/sysreset.c b/test/dm/sysreset.c
index 691683c..5aa69e0 100644
--- a/test/dm/sysreset.c
+++ b/test/dm/sysreset.c
@@ -27,8 +27,8 @@
 	/* Device 1 is the warm sysreset device */
 	ut_assertok(uclass_get_device(UCLASS_SYSRESET, 1, &dev));
 	ut_asserteq(-EACCES, sysreset_request(dev, SYSRESET_WARM));
-	ut_asserteq(-ENOSYS, sysreset_request(dev, SYSRESET_COLD));
-	ut_asserteq(-ENOSYS, sysreset_request(dev, SYSRESET_POWER));
+	ut_asserteq(-EPROTONOSUPPORT, sysreset_request(dev, SYSRESET_COLD));
+	ut_asserteq(-EPROTONOSUPPORT, sysreset_request(dev, SYSRESET_POWER));
 
 	state->sysreset_allowed[SYSRESET_WARM] = true;
 	ut_asserteq(-EINPROGRESS, sysreset_request(dev, SYSRESET_WARM));
@@ -36,7 +36,7 @@
 
 	/* Device 2 is the cold sysreset device */
 	ut_assertok(uclass_get_device(UCLASS_SYSRESET, 2, &dev));
-	ut_asserteq(-ENOSYS, sysreset_request(dev, SYSRESET_WARM));
+	ut_asserteq(-EPROTONOSUPPORT, sysreset_request(dev, SYSRESET_WARM));
 	state->sysreset_allowed[SYSRESET_COLD] = false;
 	ut_asserteq(-EACCES, sysreset_request(dev, SYSRESET_COLD));
 	state->sysreset_allowed[SYSRESET_COLD] = true;