powerpc/4xx/cpm: Fix return value of __setup() handler

__setup() handlers should return 1 to obsolete_checksetup() in
init/main.c to indicate that the boot option has been handled.

A return of 0 causes the boot option/value to be listed as an Unknown
kernel parameter and added to init's (limited) argument or environment
strings.

Also, error return codes don't mean anything to obsolete_checksetup() --
only non-zero (usually 1) or zero. So return 1 from cpm_powersave_off().

Fixes: d164f6d ("powerpc/4xx: Add suspend and idle support")
Reported-by: Igor Zhbanov <[email protected]>
Signed-off-by: Randy Dunlap <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

arch/powerpc/platforms/4xx/cpm.c

@@ -327,6 +327,6 @@ late_initcall(cpm_init);
 static int __init cpm_powersave_off(char *arg)
 {
 	cpm.powersave_off = 1;
-	return 0;
+	return 1;
 }
 __setup("powersave=off", cpm_powersave_off);