GC: Merge if statement with the enclosing one

Reported by Sonar.

Signed-off-by: Hector Oswaldo Caballero <hector.caballero@ericsson.com>
Change-Id: Ib6fe6c67d6f7697e6d60693d5cee7e9c6a227767

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java

@@ -751,17 +751,17 @@ public class GC {
 		RevObject ro = w.next();
 		while (ro != null) {
 			checkCancelled();
-			if (id2File.remove(ro.getId()) != null)
-				if (id2File.isEmpty())
-					return;
+			if (id2File.remove(ro.getId()) != null && id2File.isEmpty()) {
+				return;
+			}
 			ro = w.next();
 		}
 		ro = w.nextObject();
 		while (ro != null) {
 			checkCancelled();
-			if (id2File.remove(ro.getId()) != null)
-				if (id2File.isEmpty())
-					return;
+			if (id2File.remove(ro.getId()) != null && id2File.isEmpty()) {
+				return;
+			}
 			ro = w.nextObject();
 		}
 	}