Fix assorted ErrorProne warnings.

RELNOTES: None.
PiperOrigin-RevId: 167574104
diff --git a/src/main/java/com/google/devtools/build/lib/packages/InputFile.java b/src/main/java/com/google/devtools/build/lib/packages/InputFile.java
index c04a346..acb1809 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/InputFile.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/InputFile.java
@@ -77,7 +77,7 @@
   }
 
   public boolean isLicenseSpecified() {
-    return license != null && license != License.NO_LICENSE;
+    return license != null && license.isSpecified();
   }
 
   @Override