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strlen() is a costly way to decide whether a string is empty, as in that case, the first character will be NUL so we can check for that directly. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20231129111555.3594833-60-ardb@google.com Signed-off-by: Will Deacon <will@kernel.org>