[gfortran] PATCH clean up arith.c

[Tobias Schlüter]

Steve Kargl wrote:
> 2005-02-25  Steven G. Kargl  <kargls@comcast.net>
> 
> 	* arith.c (gfc_check_real_range):  Remove multiple returns
> 	  (check_result): New function.
> 	  (gfc_arith_uminus,gfc_arith_plus,gfc_arith_times,
> 	   gfc_arith_divide,gfc_arith_power,gfc_arith_minus): Use it.
> 
> OK for mainline?

This is ok for the mainline.

- Tobi