[fortran] fix -Wuninitialized -Werror in fortran/module.c

[Alexandre Oliva]

After much inlining and optimization, GCC is not clever enough to
realize that variable op is initialized in every path to every use.

I ran into this on ia64-linux-gnu, IIRC with bootstrap-O3.

Ok to install?

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-- 
Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/   FSF Latin America board member
Free Software Evangelist      Red Hat Brazil Compiler Engineer