arm_ffa: fix: remove deadcode in ffa_print_error_log()

address the CID 464361 Control flow issues [1]

[1]: https://lore.kernel.org/all/20230821210927.GL3953269@bill-the-cat/



Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
Cc: Tom Rini <trini@konsulko.com>