Remove empty frus from results

Makes sure more than just a header exists, this
removes all of the "unknown" frus.

Change-Id: Ib9c987bc5a5cd0600557e8afec3529cfa115c6f6
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/src/FruDevice.cpp b/src/FruDevice.cpp
index 34eb927..956ca1d 100644
--- a/src/FruDevice.cpp
+++ b/src/FruDevice.cpp
@@ -270,7 +270,7 @@
 
     size_t sum = 0;
 
-    if (fruBytes.size() < 8)
+    if (fruBytes.size() <= 8)
     {
         return false;
     }