Fix some sign-compare warnings by choosing correct datatypes.

dlls/dsound/tests/ds3d.c

@@ -90,7 +90,7 @@ const char * getDSBCAPS(DWORD xmask) {
 #undef FE
     };
     static char buffer[512];
-    int i;
+    unsigned int i;
     BOOL first = TRUE;
 
     buffer[0] = 0;

dlls/dsound/tests/dsound8.c

@@ -527,7 +527,8 @@ static HRESULT test_primary_secondary8(LPGUID lpGuid)
     DSBUFFERDESC bufdesc;
     DSCAPS dscaps;
     WAVEFORMATEX wfx, wfx2;
-    int f,ref;
+    int ref;
+    unsigned int f;
 
     /* Create the DirectSound object */
     rc=pDirectSoundCreate8(lpGuid,&dso,NULL);

dlls/x11drv/xrender.c

@@ -84,7 +84,7 @@ typedef struct
     LFANDSIZE lfsz;
     AA_Type aa_default;
     gsCacheEntryFormat * format[AA_MAXVALUE];
-    UINT count;
+    INT count;
     INT next;
 } gsCacheEntry;