Changeset 9073:649586dc385a
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gcc: Fix memset warnings concerning constant zero length

This patch solves two link-time warnings that are raised by gcc 4.7.1
after performing what seems to be an astonishing amount of unrolling
and inlining as part of Link Time Optimization (it takes almost 3
hours for ARM and uses a good 4+ GByte of memory). As the linking is
about to finish, _format_string in cprintf and memsetBlob in the
PortProxy are both causing a number of warnings: "call to
'__warn_memset_zero_len' declared with attribute warning: memset used
with constant zero length parameter;". It is not clear from the code
why this would ever happen unless gcc moves the block of code. In any
case, the changes make these warning disappear.

util/regress all passing (disregarding t1000 and eio)

compiled with gcc 4.3 - 4.7 and clang 2.9 - 3.1