BaseTools/StringFuncs: fix gcc 16 warning

StringFuncs.c: In function ‘SplitStringByWhitespace’:
StringFuncs.c:113:15: error: variable ‘Item’ set but not used [-Werror=unused-but-set-variable=]
  113 |   UINTN       Item;
      |               ^~~~

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

Author: kraxel

BaseTools/Source/C/Common/StringFuncs.c

@@ -110,7 +110,6 @@ SplitStringByWhitespace (
   CHAR8       *EndOfSubString;
   CHAR8       *EndOfString;
   STRING_LIST *Output;
-  UINTN       Item;
 
   String = CloneString (String);
   if (String == NULL) {
@@ -120,7 +119,7 @@ SplitStringByWhitespace (
 
   Output = NewStringList ();
 
-  for (Pos = String, Item = 0; Pos < EndOfString; Item++) {
+  for (Pos = String; Pos < EndOfString;) {
     while (isspace ((int)*Pos)) {
       Pos++;
     }