[PATCH v2] tpm: "qemu -tpmdev help" should return success

[marcandre . lureau]

From: Marc-André Lureau <marcandre.lur...@redhat.com>

Like other "-foo help" CLI, the qemu process should return 0 for
"-tpmdev help".

While touching this, switch to is_help_option() utility function as
suggested by Peter Maydell.

Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com>
---
 system/tpm.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/system/tpm.c b/system/tpm.c
index 8df0f6e72b..903b29c043 100644
--- a/system/tpm.c
+++ b/system/tpm.c
@@ -21,6 +21,7 @@
 #include "system/tpm.h"
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"
+#include "qemu/help_option.h"
 
 static QLIST_HEAD(, TPMBackend) tpm_backends =
     QLIST_HEAD_INITIALIZER(tpm_backends);
@@ -179,9 +180,9 @@ int tpm_config_parse(QemuOptsList *opts_list, const char 
*optstr)
 {
     QemuOpts *opts;
 
-    if (!strcmp(optstr, "help")) {
+    if (is_help_option(optstr)) {
         tpm_display_backend_drivers();
-        return -1;
+        exit(EXIT_SUCCESS);
     }
     opts = qemu_opts_parse_noisily(opts_list, optstr, true);
     if (!opts) {
-- 
2.50.0