Ensure subgroup is tested at least once,

in finding induced permutation representation of FpGroup,
even if max parameter was increased in between. This resolves gap-system#5697

lib/grpfp.gi

@@ -4051,6 +4051,7 @@ local mappow, G, max, p, gens, rels, comb, i, l, m, H, t, gen, sz,
             RelatorsOfFpGroup(G),[gen],true,false:
               cyclic:=true,limit:=1+max,quiet:=true );
     fi;
+
     if t=fail then
       # we cannot get the size within the permitted limits -- give up
       return fail;
@@ -4098,6 +4099,8 @@ local mappow, G, max, p, gens, rels, comb, i, l, m, H, t, gen, sz,
     max:=10^3*sz;
   fi;
 
+  amax:=Maximum(amax,max+1);
+
   useind:=false;
   t1:=timerFunc();
   while max<amax do