util/nvmutil: set fname earlier

this fixes the bug where if you specify an invalid command
such as:

./nvm gbe brick 9

part 9 doesn't exist, but fname isn't yet set, here.

same thing applys when running those pledge commands on
openbsd.

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/nvmutil/nvmutil.c

@@ -64,13 +64,13 @@ void (*cmd)(void) = NULL;
 int
 main(int argc, char *argv[])
 {
+	if (argc >= 2)
+		fname = argv[1];
 #ifdef __OpenBSD__
 	err_if (pledge("stdio rpath wpath unveil", NULL) == -1);
 	err_if (unveil("/dev/urandom", "r") == -1);
 #endif
 	set_cmd(argc, argv);
-
-	fname = argv[1];
 	set_io_flags(argc, argv);
 #ifdef __OpenBSD__
 	if (flags == O_RDONLY) {