Convert the value from 'int' to 'CHAR16' to match the type of variable in ShellProtocol.c.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Shumin Qiu <shumin.qiu@intel.com>
Reviewed-by: Jaben Carsey <Jaben.carsey@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15271 6f19259b-4bc3-4df7-8a09-765794883524

ShellPkg/Application/Shell/ShellProtocol.c

@@ -3006,7 +3006,7 @@ ToLower (
 
   for (Index = 0; Str[Index] != L'\0'; Index++) {
     if (Str[Index] >= L'A' && Str[Index] <= L'Z') {
-      Str[Index] -= (L'A' - L'a');
+      Str[Index] -= (CHAR16)(L'A' - L'a');
     }
   }
   return Str;