General help message cleanup

Many of the help messages were not really helpful; for example, many
commands that take no arguments would not print a correct synopsis
line, but "No additional help available." which is not exactly wrong,
but not helpful either.

Commit ``Make "usage" messages more helpful.'' changed this
partially. But it also became clear that lots of "Usage" and "Help"
messages (fields "usage" and "help" in struct cmd_tbl_s respective)
were actually redundant.

This patch cleans this up - for example:

Before:
	=> help dtt
	dtt - Digital Thermometer and Thermostat

	Usage:
	dtt         - Read temperature from digital thermometer and thermostat.

After:
	=> help dtt
	dtt - Read temperature from Digital Thermometer and Thermostat

	Usage:
	dtt

Signed-off-by: Wolfgang Denk <wd@denx.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/board/esd/ocrtc/cmd_ocrtc.c b/board/esd/ocrtc/cmd_ocrtc.c
index db2c548..5f3254d 100644
--- a/board/esd/ocrtc/cmd_ocrtc.c
+++ b/board/esd/ocrtc/cmd_ocrtc.c
@@ -55,7 +55,7 @@ int do_setdevice(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 U_BOOT_CMD(
 	setdevice,	1,	1,	do_setdevice,
 	"Set device number on pci adapter boards",
-	NULL
+	""
 );
 
 
@@ -78,7 +78,7 @@ int do_getdevice(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 U_BOOT_CMD(
 	getdevice,	1,	1,	do_getdevice,
 	"Get device number and set slot env variable",
-	NULL
+	""
 );
 
 #endif