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The purgatory code uses parts of the decompressor and provides its own warn() function, but has to include the corresponding header file to avoid a -Wmissing-prototypes warning. It turns out that this function prototype actually differs from the declaration, so change it to get a constant pointer in the declaration and the other definition as well. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/20230803082619.1369127-5-arnd@kernel.org