fixed return code of freebsd_smart_device::close()

git-svn-id: https://smartmontools.svn.sourceforge.net/svnroot/smartmontools/trunk@2920 4ea69e1a-61f1-4043-bf83-b5c94c648137

smartmontools/os_freebsd.cpp

@@ -582,8 +582,8 @@ bool freebsd_smart_device::close()
     free(fdchan);
     devicetable[fd]=NULL;
   }
-
-  return failed;
+  if(failed) return false;
+  else return true;
 }
 
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