code style fix

Author: SylvainJuge

instrumentation/jdbc/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/jdbc/ConnectionInstrumentation.java

@@ -112,7 +112,9 @@ public static AdviceScope onEnter(
     public static void stopSpan(
         @Advice.Thrown @Nullable Throwable throwable,
         @Advice.Enter @Nullable AdviceScope adviceScope) {
-      if (adviceScope != null) adviceScope.end(throwable);
+      if (adviceScope != null) {
+        adviceScope.end(throwable);
+      }
     }
   }
 }