x86/bugs: spectre_v2_heuristics_setup should check for ssbd, not rds

3b29a60 ("x86/bugs: Rename _RDS to _SSBD") missed two updates, both
in spectre_v2_heuristics_setup, so that if
spectre_v2_heuristics=ssbd=off were passed as documented in
kernel-parameters.txt, it would be ignored.  Fix it.

Orabug: 28362348
Fixes: 3b29a60 ("x86/bugs: Rename _RDS to _SSBD")
Signed-off-by: Daniel Jordan <[email protected]>
Reviewed-by: Boris Ostrovsky <[email protected]>
Reviewed-by: Alexandre Chartre <[email protected]>

Author: danieljordan10

arch/x86/kernel/cpu/bugs.c

@@ -82,8 +82,8 @@ int __init spectre_v2_heuristics_setup(char *p)
 			if (!strncmp(p, "off", 3))
 				use_ibrs_on_skylake = false;
 		}
-		len = strlen("rds");
-		if (!strncmp(p, "rds", len)) {
+		len = strlen("ssbd");
+		if (!strncmp(p, "ssbd", len)) {
 			p += len;
 			if (*p == '=')
 				++p;