drivers/char: Convert remaining use of pr_warning to pr_warn

To enable eventual removal of pr_warning

This makes pr_warn use consistent for drivers/char

Prior to this patch, there were 1 use of pr_warning and
40 uses of pr_warn in drivers/char

Signed-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Amit Shah <amit@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 file changed