more missing return values in `spec_procs2.c`

spec-procs2-return-value.txt

gcc -g -DIMPL_SECURITY -DNEW_RENT -DLEVEL_LOSS -DNEWEXP -DGROUP_NAMES -DIMPL_SECURITY -DNEW_RENT -DLEVEL_LOSS -DNEWEXP -DGROUP_NAMES  -c -o spec_procs2.o spec_procs2.c
...
spec_procs2.c:536:8: error: non-void function 'magic_user' should return a value [-Wreturn-type]
       return;
       ^
spec_procs2.c:541:5: error: non-void function 'magic_user' should return a value [-Wreturn-type]
    return;
    ^
...
spec_procs2.c:1871:8: error: non-void function 'MakeQuest' should return a value [-Wreturn-type]
       return;
       ^
...
spec_procs2.c:3132:16: error: non-void function 'monk_challenge_room' should return a value [-Wreturn-type]
               return;
               ^
spec_procs2.c:3285:7: error: non-void function 'portal' should return a value [-Wreturn-type]
      return;
      ^
...
spec_procs2.c:3734:7: error: non-void function 'astral_portal' should return a value [-Wreturn-type]
      return;
      ^
...
20 warnings and 6 errors generated.
make: *** [spec_procs2.o] Error 1