[XS] Change in coreboot[main]: amdfwtool: Print usage only once & Return zero for printing usage

[Bao Zheng (Code Review)]

Attention is currently required from: Zheng Bao.

Hello Zheng Bao,

I'd like you to do a code review.
Please visit

https://review.coreboot.org/c/coreboot/+/81929?usp=email

to review the following change.

Change subject: amdfwtool: Print usage only once & Return zero for printing usage
......................................................................

amdfwtool: Print usage only once & Return zero for printing usage

Change-Id: Ie377c65147f6a72955e840fcf60001224e9e6f84
Signed-off-by: Zheng Bao 
---
M util/amdfwtool/amdfwtool.c
M util/amdfwtool/amdfwtool.h
M util/amdfwtool/opts.c
3 files changed, 6 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/29/81929/1

diff --git a/util/amdfwtool/amdfwtool.c b/util/amdfwtool/amdfwtool.c
index 900dc56..97ff9db 100644
--- a/util/amdfwtool/amdfwtool.c
+++ b/util/amdfwtool/amdfwtool.c
@@ -1610,7 +1610,7 @@

retval = amdfwtool_getopt(argc, argv, &cb_config, &ctx);

-	if (retval) {
+	if (retval || cb_config.usage_only) {
    	return retval;
    }

diff --git a/util/amdfwtool/amdfwtool.h b/util/amdfwtool/amdfwtool.h
index 1dc445c..16daa98 100644
--- a/util/amdfwtool/amdfwtool.h
+++ b/util/amdfwtool/amdfwtool.h
@@ -413,6 +413,8 @@
 } __packed;

typedef struct _amd_cb_config {
+	bool usage_only;
+
    bool have_whitelist;
    bool unlock_secure;
    bool use_secureos;
diff --git a/util/amdfwtool/opts.c b/util/amdfwtool/opts.c
index 511ffd0..7fa31c5c 100644
--- a/util/amdfwtool/opts.c
+++ b/util/amdfwtool/opts.c
@@ -585,7 +585,9 @@
    		break;
    	case AMDFW_OPT_HELP:
    		usage();
-			retval = 1;
+			cb_config->usage_only = 1;
+			retval = 0;
+			return retval;
    		break;
    	case AMDFW_OPT_BODY_LOCATION:
    		cb_config->body_location = (uint32_t)strtoul(optarg, &tmp, 16);