Add descriptor validation function & fix issues it found

Note this is in progress, I either want to move the check function somewhere else,
or convert the printf calls to something else (I imagine some kind of log function
exists?)

tests/xua_unit_tests/src/test_simple/hid_report_descriptor.h

@@ -127,6 +127,7 @@ static const USB_HID_Short_Item_t* const hidReportDescriptorItems[] = {
             &hidLogicalMaximum0,
             &hidReportCount6,
             &hidInputConstArray,
+            &hidReportCount1,
             &hidLogicalMaximum1,
             &(hidUsageByte1Bit7.item),
             &hidInputDataVar,

tests/xua_unit_tests/src/test_simple/test_hid.c

@@ -40,6 +40,11 @@ void setUp( void )
     hidResetReportDescriptor();
 }
 
+void test_validate_report( void ) {
+    unsigned retVal = hidReportValidate();
+    TEST_ASSERT_EQUAL_UINT( HID_STATUS_GOOD, retVal );
+}
+
 // Basic report descriptor tests
 void test_unprepared_hidGetReportDescriptor( void )
 {