Ooops, override the right variable

Change-Id: I6a43176211326364562e69a6a32f9156495e7a82
diff --git a/generate-factory-images-common.sh b/generate-factory-images-common.sh
index b4e935c..95441a6 100644
--- a/generate-factory-images-common.sh
+++ b/generate-factory-images-common.sh
@@ -18,7 +18,7 @@
 fi
 if test "$BOOTLOADERSRC" = ""
 then
-  RADIOSRC=bootloader.img
+  BOOTLOADERSRC=bootloader.img
 fi
 rm -rf tmp
 mkdir -p tmp/$PRODUCT-$VERSION