libgo patch committed: Remove unused variable

[Ian Lance Taylor]

This patch from Peter Collingbourne removes an unused variable from
libgo.  The variable is set but never used, and gccgo was not giving an
error about such cases.  I will shortly commit a gccgo patch to detect
this case.  This patch bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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