Use -1 as file descriptor "not open" value instead of 0
[debian/gnuradio] / vrt /
drwxr-xr-x   ..
-rw-r--r-- 28 .gitignore
-rw-r--r-- 943 Makefile.am
drwxr-xr-x - apps
drwxr-xr-x - include
drwxr-xr-x - lib
-rw-r--r-- 241 vrt.pc.in