Fix crash in nsCodebasePrincipal::Equals when browser.registration.enable is set to true.

r=racham


git-svn-id: svn://10.0.0.236/trunk@59687 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/caps/src/nsCertificatePrincipal.cpp

@@ -75,6 +75,10 @@ nsCertificatePrincipal::Equals(nsIPrincipal * other, PRBool * result)
         *result = PR_TRUE;
         return NS_OK;
     }
+    if (!other) {
+        *result = PR_FALSE;
+        return NS_OK;
+    }
     nsresult rv;
     nsCOMPtr<nsICertificatePrincipal> otherCertificate = 
         do_QueryInterface(other, &rv);

mozilla/caps/src/nsCodebasePrincipal.cpp

@@ -72,6 +72,10 @@ nsCodebasePrincipal::Equals(nsIPrincipal *other, PRBool *result)
         *result = PR_TRUE;
         return NS_OK;
     }
+    if (!other) {
+        *result = PR_FALSE;
+        return NS_OK;
+    }
     nsCOMPtr<nsICodebasePrincipal> otherCodebase;
     if (NS_FAILED(other->QueryInterface(
             NS_GET_IID(nsICodebasePrincipal),