tools: remove stat() check for supported interface

If an unsupported interface is requested, the open() call will simply
fail.

Signed-off-by: Benjamin Fair <benjaminfair@google.com>
Change-Id: Iefd11657d957931873a4d20246d9ccdd791ba0e5
diff --git a/tools/updater.cpp b/tools/updater.cpp
index 25f7dab..8639edd 100644
--- a/tools/updater.cpp
+++ b/tools/updater.cpp
@@ -46,10 +46,10 @@
     bool goalSupported = updater->checkAvailable(layout);
     if (!goalSupported)
     {
-        throw ToolException("Goal firmware or interface not supported");
+        throw ToolException("Goal firmware not supported");
     }
 
-    /* Yay, our data handler is supported. */
+    /* Yay, our layout type is supported. */
     try
     {
         /* Send over the firmware image. */