msvcp90: Avoid signed-unsigned integer comparisons.

dlls/msvcp90/ios.c

@@ -2533,7 +2533,7 @@ FILE* __cdecl _Fiopen_wchar(const wchar_t *name, int mode, int prot)
     };
 
     int real_mode = mode & ~(OPENMODE_ate|OPENMODE__Nocreate|OPENMODE__Noreplace|OPENMODE_binary);
-    int mode_idx;
+    unsigned int mode_idx;
     FILE *f = NULL;
 
     TRACE("(%s %d %d)\n", debugstr_w(name), mode, prot);

dlls/msvcp90/misc.c

@@ -195,7 +195,7 @@ unsigned short __cdecl wctype(const char *property)
         { "upper", _UPPER },
         { "xdigit", _HEX }
     };
-    int i;
+    unsigned int i;
 
     for(i=0; i<sizeof(properties)/sizeof(properties[0]); i++)
         if(!strcmp(property, properties[i].name))