Invert a test to reduce indent.

Summary:
I'm going to make this method more complicated, so preemptively reducing
the indent.

Test Plan: Unit tests.
diff --git a/src/com/facebook/buck/util/concurrent/MoreFutures.java b/src/com/facebook/buck/util/concurrent/MoreFutures.java
index a59e77a..6f4d175 100644
--- a/src/com/facebook/buck/util/concurrent/MoreFutures.java
+++ b/src/com/facebook/buck/util/concurrent/MoreFutures.java
@@ -64,22 +64,22 @@
    *     cancelled.
    */
   public static boolean isSuccess(ListenableFuture<?> future) {
-    if (future.isDone()) {
-      try {
-        future.get();
-        return true;
-      } catch (ExecutionException e) {
-        // The computation threw an exception, so it did not complete successfully.
-        return false;
-      } catch (CancellationException e) {
-        // The computation was cancelled, so it did not complete successfully.
-        return false;
-      } catch (InterruptedException e) {
-        throw new RuntimeException("Should not be possible to interrupt a resolved future.", e);
-      }
-    } else {
+    if (!future.isDone()) {
       return false;
     }
+
+    try {
+      future.get();
+      return true;
+    } catch (ExecutionException e) {
+      // The computation threw an exception, so it did not complete successfully.
+      return false;
+    } catch (CancellationException e) {
+      // The computation was cancelled, so it did not complete successfully.
+      return false;
+    } catch (InterruptedException e) {
+      throw new RuntimeException("Should not be possible to interrupt a resolved future.", e);
+    }
   }
 
   /**