staging: speakup: fix unnecessary long line

Fix checkpatch message:
WARNING: line over 80 characters

Change "bit mask" for "bitmask" to have a line shorter than 80 characters.
Signed-off-by: Michael Mera <dev@michaelmera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/speakup/speakup_decpc.c

@@ -84,7 +84,7 @@
 #define	CTRL_last_index		0x0b00	/* get last index spoken */
 #define	CTRL_io_priority	0x0c00	/* change i/o priority */
 #define	CTRL_free_mem		0x0d00	/* get free paragraphs on module */
-#define	CTRL_get_lang		0x0e00	/* return bit mask of loaded languages */
+#define	CTRL_get_lang		0x0e00	/* return bitmask of loaded languages */
 #define	CMD_test		0x2000	/* self-test request */
 #define	TEST_mask		0x0F00	/* isolate test field */
 #define	TEST_null		0x0000	/* no test requested */