qapi: Convert block_passwd

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/blockdev.c b/blockdev.c
index dbf0251..aba7aaf 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -15,6 +15,7 @@
 #include "qemu-config.h"
 #include "sysemu.h"
 #include "block_int.h"
+#include "qmp-commands.h"
 
 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
 
@@ -710,28 +711,25 @@
     return eject_device(mon, bs, force);
 }
 
-int do_block_set_passwd(Monitor *mon, const QDict *qdict,
-                        QObject **ret_data)
+void qmp_block_passwd(const char *device, const char *password, Error **errp)
 {
     BlockDriverState *bs;
     int err;
 
-    bs = bdrv_find(qdict_get_str(qdict, "device"));
+    bs = bdrv_find(device);
     if (!bs) {
-        qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
-        return -1;
+        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+        return;
     }
 
-    err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
+    err = bdrv_set_key(bs, password);
     if (err == -EINVAL) {
-        qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
-        return -1;
+        error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
+        return;
     } else if (err < 0) {
-        qerror_report(QERR_INVALID_PASSWORD);
-        return -1;
+        error_set(errp, QERR_INVALID_PASSWORD);
+        return;
     }
-
-    return 0;
 }
 
 int do_change_block(Monitor *mon, const char *device,