powerpc/eeh: Remove unnecessary cast

Sparse reports a warning when casting to an int. There is no need to
cast in the first place, so drop them.

Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231011053711.93427-12-bgray@linux.ibm.com