cmd_dump: Open in noexcl mode

no need to make it harder to dump than it needs to be

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

c_src/cmd_dump.c

@@ -112,6 +112,7 @@ int cmd_dump(int argc, char *argv[])
 	int fd, opt;
 
 	opt_set(opts, direct_io,	false);
+	opt_set(opts, noexcl,		true);
 	opt_set(opts, read_only,	true);
 	opt_set(opts, nochanges,	true);
 	opt_set(opts, norecovery,	true);