Revert "Bug #19573096: LOADING CORRUPTED GEOMETRY DATA INTO A"

This reverts commit c7de768ec20f5167cff2c69a255d95ca2eded46a.

storage/myisam/rt_split.c

@@ -68,10 +68,6 @@ static double mbr_join_square(const double *a, const double *b, int n_dim)
     b += 2;
   }while (a != end);
 
-   /* Check for infinity or NaN */
-  if (my_isinf(square) || isnan(square))
-    square = DBL_MAX;
-
   return square;
 }
 
@@ -106,9 +102,6 @@ static void pick_seeds(SplitStruct *node, int n_entries,
   double max_d = -DBL_MAX;
   double d;
 
-  *seed_a = node;
-  *seed_b = node + 1;
-
   for (cur1 = node; cur1 < lim1; ++cur1)
   {
     for (cur2=cur1 + 1; cur2 < lim2; ++cur2)