The `%pA` format specifier is only intended to be used from Rust.

`checkpatch.pl` already gives a warning for invalid specificers:

    WARNING: Invalid vsprintf pointer extension '%pA'

This makes it an error and introduces an explanatory message:

    ERROR: Invalid vsprintf pointer extension '%pA' - '%pA' is only intended to be used from Rust code
Suggested-by: NKees Cook <keescook@chromium.org>
Reviewed-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Co-developed-by: NAlex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: NAlex Gaynor <alex.gaynor@gmail.com>
Co-developed-by: NWedson Almeida Filho <wedsonaf@google.com>
Signed-off-by: NWedson Almeida Filho <wedsonaf@google.com>
Co-developed-by: NJoe Perches <joe@perches.com>
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NMiguel Ojeda <ojeda@kernel.org>