Several UINT variables are reciving negative INT values

In several cases UINT variables are reciving negative INT values.
A list of these bugs under this line:

=== MenuButtonUp ===
http://doxygen.reactos.org/d2/d74/user32_2windows_2menu_8c_source.html#l02634
Variable: Uint Id
Recives negative values from: NtUserMenuItemFromPoint

===MenuMoveMouse ===
http://doxygen.reactos.org/d2/d74/user32_2windows_2menu_8c_source.html#l02755
Variable: Uint Index
Recives negative values from: NtUserMenuItemFromPoint

===src_register===
http://doxygen.reactos.org/d8/d98/st__glsl__to__tgsi_8cpp_a738629fb8497607a433533d12ec260a4.html#a738629fb8497607a433533d12ec260a4

index is defined as unsigned int.

Mesa will never reach
04027 if (index < 0)

==co_IntSetScrollInfo==
http://doxygen.reactos.org/d4/ddf/ntuser_2scrollbar_8c_a1309761ab4127519c60a57be43bc9197.html#a1309761ab4127519c60a57be43bc9197
UINT nPage;

00427 /* Make sure the page size is valid */
00428 if (Info->nPage < 0)
00429

{ 00430 pSBData->page = Info->nPage = 0; 00431 }

00432 else

This check is not needed( basically the dev is forcing nPage to be 0 in case it is negative, but it is an UINT).