dlm: Remove seq_printf() return checks and use seq_has_overflowed()

The seq_printf() return is going away soon and users of it should
check seq_has_overflowed() to see if the buffer is full and will
not accept any more data.

Convert functions returning int to void where seq_printf() is used.

Link: http://lkml.kernel.org/p/43590057bcb83846acbbcc1fe641f792b2fb7773.1412031505.git.joe@perches.com
Link: http://lkml.kernel.org/r/[email protected]

Acked-by: David Teigland <[email protected]>
Cc: Christine Caulfield <[email protected]>
Cc: [email protected]
Signed-off-by: Joe Perches <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>