[Bug 38337] clang compiling warnings

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38337

--- Comment #5 from Sergey Isakov <isakov-sl at bk.ru> ---
More warnings:
-----
/programs/winedbg/gdbproxy.c:2146:23: warning: comparison of
      constant -1 with expression of type 'enum be_xpoint_type' is always false
      [-Wtautological-constant-out-of-range-compare]
        if (xpt->type == -1)
            ~~~~~~~~~ ^  ~~
-------
/programs/winemine/main.c:83:9: warning: logical not is only
      applied to the left hand side of this comparison
[-Wlogical-not-parentheses]
    if( !RegQueryValueExW( hkey, xposW, NULL, &type,
        ^
--------
/dlls/xmllite/tests/reader.c:245:20: warning: comparison of
      constant -1 with expression of type 'XmlReadState' (aka 'enum
XmlReadState') is always false
      [-Wtautological-constant-out-of-range-compare]
    if (exp_broken == -1)
        ~~~~~~~~~~ ^  ~~
----------
/dlls/wintab32/context.c:233:31: warning: taking the absolute
      value of unsigned type 'unsigned int' has no effect [-Wabsolute-value]
                packet->pkY = abs(ptr->context.lcOutExtY + packet->pkY);
                              ^
------------
/dlls/winmm/tests/mixer.c:637:25: warning: taking the absolute
      value of unsigned type 'unsigned int' has no effect [-Wabsolute-value]
                    if (abs(ret_value.dwValue-new_value.dwValue)<=1) {
                        ^
-----------
/dlls/winmm/joystick.c:107:6: warning: taking the absolute
      value of unsigned type 'unsigned int' has no effect [-Wabsolute-value]
            abs(joy->ji.wZpos - ji.wZpos) > joy->threshold) {
            ^
-----------
/programs/winedbg/types.c:78:13: warning: variable 'bt' is used
      uninitialized whenever '||' condition is true [-Wsometimes-uninitialized]
        if (!types_get_info(&type, TI_GET_LENGTH, &size) ||
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
----------

Hope authors of these codes will correct own mistakes protected by LGPL.

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