folly/dynamic-inl.h: avoid -Wsign-compare error
Summary: * folly/dynamic-inl.h (format): Add an explicit int-to-size_t cast (that is ok because we've just ensured it is non-negative) to avoid this error from gcc-4.9: folly/dynamic-inl.h:953:29: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] Test Plan: Run this and note there are fewer errors than before: fbconfig --platform-all=gcc-4.9-glibc-2.20 -r folly && fbmake dbgo Reviewed By: delong.j@fb.com Subscribers: trunkagent, folly-diffs@ FB internal diff: D1773242 Tasks: 5941250 Signature: t1:1773242:1420822301:b1e3c065cd25728c77957ce9e1f52e884ba8693b
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