[Patch, Fortran] ANother two memory leaks plugged

[Tobias Burnus]

First, I have now regtested and committed the show_locus bug fix as Rev. 
190752.
Cf. http://gcc.gnu.org/ml/fortran/2012-08/msg00197.html

Secondly, the attached patch fixes two valgrind-reported memory issues 
when compiling the Polyhedron 2005 files:

a) decl.c: DATA statement's value matching. Here, one calls 
gfc_match_rvalue, but if one doesn't have a structure constructor, one 
ignores the result and continues by trying to match other kinds of 
expressions, without freeing the previous result.

b) When resolving DATA, temporary variables weren't released.

Build and regtested on x86-64-linux.
Committed as Rev. 190751.

Tobias
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