drivers: fix comment typo diable -> disable.

The below patch fixes a typo "diable" to "disable" and also fixes another typo in a comment.
Please let me know if this is correct or not.

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/isdn/mISDN/dsp_cmx.c

@@ -112,7 +112,7 @@
  * Disable rx-data:
  * If cmx is realized in hardware, rx data will be disabled if requested by
  * the upper layer. If dtmf decoding is done by software and enabled, rx data
- * will not be diabled but blocked to the upper layer.
+ * will not be disabled but blocked to the upper layer.
  *
  * HFC conference engine:
  * If it is possible to realize all features using hardware, hardware will be