Decrease indentation in setupTipCommitBitmaps

Avoid leaving the reader in suspense by handling the unusual
(!RevCommit) case first.  As a nice side effect, there is less nesting
to keep track of in the rest of the loop body.

No functional change intended.

Change-Id: I1580de444fccde08070f696218c12041151a924a

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriterBitmapPreparer.java

@@ -339,9 +339,11 @@ class PackWriterBitmapPreparer {
 			if ((entry.getFlags() & FLAG_REUSE) != FLAG_REUSE) {
 				continue;
 			}
-
 			RevObject ro = rw.peel(rw.parseAny(entry));
-			if (ro instanceof RevCommit) {
+			if (!(ro instanceof RevCommit)) {
+				continue;
+			}
+
 			RevCommit rc = (RevCommit) ro;
 			reuseCommits.add(new BitmapCommit(rc, false, entry.getFlags()));
 			rw.markUninteresting(rc);
@@ -351,7 +353,6 @@ class PackWriterBitmapPreparer {
 					Constants.OBJ_COMMIT).trim();
 			reuse.add(rc, Constants.OBJ_COMMIT);
 		}
-		}
 
 		// Add branch tips that are not represented in old bitmap indices. Set
 		// up the RevWalk to walk the new commits not in the old packs.
@@ -360,7 +361,10 @@ class PackWriterBitmapPreparer {
 		Set<RevCommit> peeledWant = new HashSet<RevCommit>(want.size());
 		for (AnyObjectId objectId : want) {
 			RevObject ro = rw.peel(rw.parseAny(objectId));
-			if (ro instanceof RevCommit && !reuse.contains(ro)) {
+			if (!(ro instanceof RevCommit) || reuse.contains(ro)) {
+				continue;
+			}
+
 			RevCommit rc = (RevCommit) ro;
 			peeledWant.add(rc);
 			rw.markStart(rc);
@@ -370,7 +374,6 @@ class PackWriterBitmapPreparer {
 			bitmap.add(rc, Constants.OBJ_COMMIT);
 			tipCommitBitmaps.add(new BitmapBuilderEntry(rc, bitmap));
 		}
-		}
 
 		// Create a list of commits in reverse order (older to newer).
 		// For each branch that contains the commit, mark its parents as being
@@ -382,12 +385,13 @@ class PackWriterBitmapPreparer {
 			commits[--pos] = rc;
 			for (BitmapBuilderEntry entry : tipCommitBitmaps) {
 				BitmapBuilder bitmap = entry.getBuilder();
-				if (bitmap.contains(rc)) {
+				if (!bitmap.contains(rc)) {
+					continue;
+				}
 				for (RevCommit c : rc.getParents()) {
 					bitmap.add(c, Constants.OBJ_COMMIT);
 				}
 			}
-			}
 			pm.update(1);
 		}