scripts: Remove blank lines from end of helper files

Change-Id: Ie972f2d8b6bca633fbfb4745f29eab183cde7acb
diff --git a/scripts/helper_file_generator.py b/scripts/helper_file_generator.py
index 7746c29..6b27103 100644
--- a/scripts/helper_file_generator.py
+++ b/scripts/helper_file_generator.py
@@ -134,6 +134,9 @@
     def endFile(self):
         dest_file = ''
         dest_file += self.OutputDestFile()
+        # Remove blank lines at EOF
+        if dest_file.endswith('\n'):
+            dest_file = dest_file[:-1]
         write(dest_file, file=self.outFile);
         # Finish processing in superclass
         OutputGenerator.endFile(self)