[Warnings] Fixed Array Access out of Bounds

The way this section of code was written could potentially lead to an
array access out of bounds. This was causing a warning in future
versions of GCC. Simply fixed this issue.

Author: AlexandreSinger

vpr/src/draw/draw_rr.cpp

@@ -926,8 +926,7 @@ void draw_get_rr_pin_coords(const t_rr_node& node, float* xcen, float* ycen, con
 
         default:
             vpr_throw(VPR_ERROR_OTHER, __FILE__, __LINE__,
-                      "in draw_get_rr_pin_coords: Unexpected side %s.\n",
-                      SIDE_STRING[pin_side]);
+                      "in draw_get_rr_pin_coords: Unexpected side.\n");
             break;
     }