bs11_config: add brackets to fix warning in argument parsing

Change-Id: I2f02e09a21ca622b03fd966445f533263a499c8d
diff --git a/openbsc/src/utils/bs11_config.c b/openbsc/src/utils/bs11_config.c
index 0d13e25..3fb74bf 100644
--- a/openbsc/src/utils/bs11_config.c
+++ b/openbsc/src/utils/bs11_config.c
@@ -850,10 +850,11 @@
 			break;
 		}
 	}
-	if (optind < argc)
+	if (optind < argc) {
 		command = argv[optind];
 	        if (optind+1 < argc)
 			value = argv[optind+1];
+	}
 
 }