tty: rocket: fix comment of ROCKET_SPD_HI

This comment does not reflect the actual code.  It should be 57600,
not 56000.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/rocket.h

@@ -44,7 +44,7 @@ struct rocket_version {
 #define ROCKET_HUP_NOTIFY	0x00000004
 #define ROCKET_SPLIT_TERMIOS	0x00000008
 #define ROCKET_SPD_MASK		0x00000070
-#define ROCKET_SPD_HI		0x00000010	/* Use 56000 instead of 38400 bps */
+#define ROCKET_SPD_HI		0x00000010	/* Use 57600 instead of 38400 bps */
 #define ROCKET_SPD_VHI		0x00000020	/* Use 115200 instead of 38400 bps */
 #define ROCKET_SPD_SHI		0x00000030	/* Use 230400 instead of 38400 bps */
 #define ROCKET_SPD_WARP	        0x00000040	/* Use 460800 instead of 38400 bps */