Remove always true condition in cJSON.c (#539)

cJSON.c

@@ -511,10 +511,8 @@ static unsigned char* ensure(printbuffer * const p, size_t needed)
 
             return NULL;
         }
-        if (newbuffer)
-        {
-            memcpy(newbuffer, p->buffer, p->offset + 1);
-        }
+        
+        memcpy(newbuffer, p->buffer, p->offset + 1);
         p->hooks.deallocate(p->buffer);
     }
     p->length = newsize;