sparc64: NMI watchdog: 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 setup_nmi_watchdog().

Fixes: e5553a6 ("sparc64: Implement NMI watchdog on capable cpus.")
Signed-off-by: Randy Dunlap <[email protected]>
Reported-by: Igor Zhbanov <[email protected]>
Link: lore.kernel.org/r/[email protected]
Cc: "David S. Miller" <[email protected]>
Cc: [email protected]
Cc: Sam Ravnborg <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: [email protected]
Cc: Arnd Bergmann <[email protected]>
Cc: Andreas Larsson <[email protected]>
Signed-off-by: Andreas Larsson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: rddunlap

arch/sparc/kernel/nmi.c

@@ -279,7 +279,7 @@ static int __init setup_nmi_watchdog(char *str)
 	if (!strncmp(str, "panic", 5))
 		panic_on_timeout = 1;
 
-	return 0;
+	return 1;
 }
 __setup("nmi_watchdog=", setup_nmi_watchdog);