Don't bomb out when using keylocation=file://

Avoid following the error path when the operation in fact succeeded.

Reviewed-by: Ryan Moeller <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: James Wah <[email protected]>
Closes #11651

Author: abrasive

lib/libzfs/libzfs_crypto.c

@@ -532,6 +532,8 @@ get_key_material(libzfs_handle_t *hdl, boolean_t do_verify, boolean_t newkey,
 
 		break;
 	case ZFS_KEYLOCATION_URI:
+		ret = ENOTSUP;
+
 		for (handler = uri_handlers; handler->zuh_scheme != NULL;
 		    handler++) {
 			if (strcmp(handler->zuh_scheme, uri_scheme) != 0)
@@ -544,9 +546,11 @@ get_key_material(libzfs_handle_t *hdl, boolean_t do_verify, boolean_t newkey,
 			break;
 		}
 
-		ret = ENOTSUP;
-		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
-		    "URI scheme is not supported"));
+		if (ret == ENOTSUP) {
+			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+			    "URI scheme is not supported"));
+			goto error;
+		}
 
 		break;
 	default: