radeon/llvm: Add missing "%s" format string to fprintf.
radeon/llvm: Add missing "%s" format string to fprintf.

This fixes a compilation warning with -Wformat-security.

CC: "9.2" <mesa-stable@lists.freedesktop.org>

Reviewed-by: Tom Stellard <85590917cb30a670bf23f5b4273617f8815d1e87@amd.com>

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