No warnings

kernel/libk/string.c

@@ -94,7 +94,6 @@ char* strncat (char* dest, const char* src, size_t n) {
 }
 
 void* memmove (void* dest, const void* src, unsigned int n) {
-  unsigned char isCopyRequire = 0; // flag bit
   char* pcSource = (char*)src;
   char* pcDstn = (char*)dest;
   // return if pcDstn and pcSource is NULL