sparc: vDSO: 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 vdso_setup().

Fixes: 9a08862 ("vDSO for sparc")
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: Dan Carpenter <[email protected]>
Cc: Nick Alcock <[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/vdso/vma.c

@@ -449,9 +449,8 @@ static __init int vdso_setup(char *s)
 	unsigned long val;
 
 	err = kstrtoul(s, 10, &val);
-	if (err)
-		return err;
-	vdso_enabled = val;
-	return 0;
+	if (!err)
+		vdso_enabled = val;
+	return 1;
 }
 __setup("vdso=", vdso_setup);