orangefs: fix build warning from debugfs cleanup patch

Stephen writes:
	After merging the driver-core tree, today's linux-next build (x86_64
	allmodconfig) produced this warning:

	fs/orangefs/orangefs-debugfs.c: In function 'orangefs_debugfs_init':
	fs/orangefs/orangefs-debugfs.c:193:1: warning: label 'out' defined but not used [-Wunused-label]
	 out:
	 ^~~
	fs/orangefs/orangefs-debugfs.c: In function 'orangefs_kernel_debug_init':
	fs/orangefs/orangefs-debugfs.c:204:17: warning: unused variable 'ret' [-Wunused-variable]
	  struct dentry *ret;
	                 ^~~
Fix this up and change the return type of the function to void as it can
not fail, which cleans up some more code and variables as well.

Cc: Mike Marshall <hubcap@omnibond.com>
Cc: Martin Brandenburg <martin@omnibond.com>
Cc: devel@lists.orangefs.org
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: f095adba ("orangefs: no need to check return value of debugfs_create functions")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>