Change as suggested

Co-Authored-By: per1234 <accounts@perglass.com>

Author: ashutoshshrm529

src/ArduinoGraphics.cpp

@@ -227,7 +227,7 @@ void ArduinoGraphics::circle(int x, int y, int radius)
   int x2 = x1 + radius;
 
   for (x = x1; x <= x2; x++) {
-      y2 = (int) y1 + sqrt((radius*radius)-(x*x)) ;
+      int y2 = (int) y1 + sqrt((radius*radius)-(x*x)) ;
       for (y = y1; y <= y2; y++) {
           if ((y == y2) && _stroke) {
             // stroke