libbacktrace patch committed: Always clear union in read_attribute

[Ian Lance Taylor]

http://gcc.gnu.org/ml/gcc-regression/2012-11/msg00279.html points out a
may-be-used-uninitialized warning, turned into an error, when building
libbacktrace.  The warning is incorrect: the value is initialized.  The
warning will no longer turn into an error.  But it is easy enough to
force an initialization to avoid the warning.  That is what this patch
does.  Bootstrapped and ran libbacktrace testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian


2012-11-20  Ian Lance Taylor  <iant@google.com>

	* dwarf.c (read_attribute): Always clear val.


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