Add a binary 'loader' so that builtin applications can be executed from the BINFS file system

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5525 42af7a65-404d-4744-a932-0658087f49c3

nuttx/fs/fs_mount.c

@@ -221,7 +221,7 @@ int mount(FAR const char *source, FAR const char *target,
   /* Find the specified filesystem.  Try the block driver file systems first */
 
 #ifdef BDFS_SUPPORT
-  if ((mops = mount_findfs(g_bdfsmap, filesystemtype)) != NULL)
+  if (source && (mops = mount_findfs(g_bdfsmap, filesystemtype)) != NULL)
     {
       /* Make sure that a block driver argument was provided */