[POWERPC] ps3: always make sure were running on a PS3
Add missing checks to PS3 specific drivers ps3av and sys-manager to verify that we are actually running on a PS3 (pointed out by Arnd). Correct existing checks in other subsystems/drivers to return -ENODEV instead of zero. Signed-off-by: NGeert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Signed-off-by: NArnd Bergmann <arnd.bergmann@de.ibm.com>
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