hid: Return HIDP_STATUS_SUCCESS even if no usages are found.

dlls/hid/hidp.c

@@ -328,7 +328,6 @@ NTSTATUS WINAPI HidP_GetUsages( HIDP_REPORT_TYPE report_type, USAGE usage_page,
     *usages_len = params.usages - usages;
     if (status != HIDP_STATUS_SUCCESS) return status;
 
-    if (*usages_len == 0) return HIDP_STATUS_USAGE_NOT_FOUND;
     if (params.usages > params.usages_end) return HIDP_STATUS_BUFFER_TOO_SMALL;
     return status;
 }
@@ -672,7 +671,6 @@ NTSTATUS WINAPI HidP_GetUsagesEx( HIDP_REPORT_TYPE report_type, USHORT collectio
     *usages_len = params.usages - usages;
     if (status != HIDP_STATUS_SUCCESS) return status;
 
-    if (*usages_len == 0) return HIDP_STATUS_USAGE_NOT_FOUND;
     if (params.usages > params.usages_end) return HIDP_STATUS_BUFFER_TOO_SMALL;
     return status;
 }

dlls/ntoskrnl.exe/tests/ntoskrnl.c

@@ -2220,6 +2220,12 @@ static void test_hidp(HANDLE file, HANDLE async_file, int report_id, BOOL polled
                             report, caps.InputReportByteLength);
     ok(status == HIDP_STATUS_SUCCESS, "HidP_SetUsages returned %#x\n", status);
 
+    value = ARRAY_SIZE(usages);
+    status = HidP_GetUsages(HidP_Input, HID_USAGE_PAGE_KEYBOARD, 0, usages, &value, preparsed_data,
+                            report, caps.InputReportByteLength);
+    ok(status == HIDP_STATUS_SUCCESS, "HidP_GetUsages returned %#x\n", status);
+    ok(value == 0, "got usage count %d, expected %d\n", value, 2);
+
     usages[0] = 0x9;
     usages[1] = 0xb;
     usages[2] = 0xa;

dlls/xinput1_3/tests/xinput.c

@@ -678,7 +678,6 @@ static void check_hid_caps(DWORD index, HANDLE device,  PHIDP_PREPARSED_DATA pre
 
         length = ARRAY_SIZE(usages);
         status = HidP_GetUsages(HidP_Input, HID_USAGE_PAGE_BUTTON, 0, usages, &length, preparsed, buffer, hid_caps->InputReportByteLength);
-        todo_wine
         ok(status == HIDP_STATUS_SUCCESS, "HidP_GetUsages returned %#x\n", status);
         ok(length == 0, "got length %u\n", length);