ObjectWalk: Prefer boolean operators over logical operators in comparisons

Using the | and & operators in boolean conditions results in a warning
from Error Prone:

  [ShortCircuitBoolean]
  Prefer the short-circuiting boolean operators && and || to & and |.
  see https://errorprone.info/bugpattern/ShortCircuitBoolean

Change-Id: I182f986263b8b9ac189907f4bd1662b4092a52d8
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/revwalk/ObjectWalk.java

@@ -497,7 +497,7 @@ public class ObjectWalk extends RevWalk {
 				continue;
 			}
 			visitationPolicy.visited(o);
-			if ((o.flags & UNINTERESTING) == 0 | boundary) {
+			if ((o.flags & UNINTERESTING) == 0 || boundary) {
 				if (o instanceof RevTree) {
 					// The previous while loop should have exhausted the stack
 					// of trees.