The registered -z parameter string shouldn't end with a comma.

If it ends with a comma, then, if you don't provide any parameters, you
get a "no such -z statistic" message followed by a list of available
statistics.

If it doesn't end with a comma, then, if you don't provide any
parameters *and* a parameter is required, you get a usage message, which
is more useful - and, in many of those cases, a parameter *isn't*
required.

Change-Id: I81275ea41ad4611d8210ca3cb07c09f0abde58f2
Reviewed-on: https://code.wireshark.org/review/5308
Reviewed-by: Guy Harris <guy@alum.mit.edu>

ui/cli/tap-ansi_astat.c

@@ -156,7 +156,7 @@ ansi_a_stat_init(const char *opt_arg _U_, void *userdata _U_)
 static stat_tap_ui ansi_a_stat_ui = {
     REGISTER_STAT_GROUP_GENERIC,
     NULL,
-    "ansi_a,",
+    "ansi_a",
     ansi_a_stat_init,
     -1,
     0,

ui/cli/tap-bootpstat.c

@@ -177,7 +177,7 @@ dhcpstat_init(const char *opt_arg, void *userdata _U_)
 static stat_tap_ui dhcpstat_ui = {
 	REGISTER_STAT_GROUP_GENERIC,
 	NULL,
-	"bootp,stat,",
+	"bootp,stat",
 	dhcpstat_init,
 	-1,
 	0,

ui/cli/tap-comparestat.c

@@ -565,7 +565,7 @@ comparestat_init(const char *opt_arg, void *userdata _U_)
 static stat_tap_ui comparestat_ui = {
 	REGISTER_STAT_GROUP_GENERIC,
 	NULL,
-	"compare,",
+	"compare",
 	comparestat_init,
 	-1,
 	0,

ui/cli/tap-dcerpcstat.c

@@ -291,7 +291,7 @@ dcerpcstat_init(const char *opt_arg, void *userdata _U_)
 static stat_tap_ui dcerpcstat_ui = {
 	REGISTER_STAT_GROUP_GENERIC,
 	NULL,
-	"dcerpc,srt,",
+	"dcerpc,srt",
 	dcerpcstat_init,
 	-1,
 	0,

ui/cli/tap-gsm_astat.c

@@ -342,7 +342,7 @@ gsm_a_stat_init(const char *opt_arg _U_, void *userdata _U_)
 static stat_tap_ui gsm_a_stat_ui = {
     REGISTER_STAT_GROUP_GENERIC,
     NULL,
-    "gsm_a,",
+    "gsm_a",
     gsm_a_stat_init,
     -1,
     0,

ui/cli/tap-httpstat.c

@@ -323,7 +323,7 @@ httpstat_init(const char *opt_arg, void *userdata _U_)
 static stat_tap_ui httpstat_ui = {
 	REGISTER_STAT_GROUP_GENERIC,
 	NULL,
-	"http,stat,",
+	"http,stat",
 	httpstat_init,
 	-1,
 	0,

ui/cli/tap-iostat.c

@@ -1499,7 +1499,7 @@ iostat_init(const char *opt_arg, void *userdata _U_)
 static stat_tap_ui iostat_ui = {
     REGISTER_STAT_GROUP_GENERIC,
     NULL,
-    "io,stat,",
+    "io,stat",
     iostat_init,
     -1,
     0,

ui/cli/tap-protocolinfo.c

@@ -133,7 +133,7 @@ protocolinfo_init(const char *opt_arg, void *userdata _U_)
 static stat_tap_ui protocolinfo_ui = {
 	REGISTER_STAT_GROUP_GENERIC,
 	NULL,
-	"proto,colinfo,",
+	"proto,colinfo",
 	protocolinfo_init,
 	-1,
 	0,

ui/cli/tap-rpcstat.c

@@ -345,7 +345,7 @@ rpcstat_init(const char *opt_arg, void *userdata _U_)
 static stat_tap_ui rpcstat_ui = {
 	REGISTER_STAT_GROUP_GENERIC,
 	NULL,
-	"rpc,srt,",
+	"rpc,srt",
 	rpcstat_init,
 	-1,
 	0,

ui/cli/tap-rtspstat.c

@@ -276,7 +276,7 @@ rtspstat_init(const char *opt_arg, void *userdata _U_)
 static stat_tap_ui rtspstat_ui = {
 	REGISTER_STAT_GROUP_GENERIC,
 	NULL,
-	"rtsp,stat,",
+	"rtsp,stat",
 	rtspstat_init,
 	-1,
 	0,

ui/cli/tap-scsistat.c

@@ -254,7 +254,7 @@ scsistat_init(const char *opt_arg, void* userdata _U_)
 static stat_tap_ui scsistat_ui = {
 	REGISTER_STAT_GROUP_GENERIC,
 	NULL,
-	"scsi,srt,",
+	"scsi,srt",
 	scsistat_init,
 	-1,
 	0,

ui/cli/tap-wspstat.c

@@ -279,7 +279,7 @@ wspstat_init(const char *opt_arg, void *userdata _U_)
 static stat_tap_ui wspstat_ui = {
 	REGISTER_STAT_GROUP_GENERIC,
 	NULL,
-	"wsp,stat,",
+	"wsp,stat",
 	wspstat_init,
 	-1,
 	0,

ui/gtk/dcerpc_stat.c

@@ -717,7 +717,7 @@ void gtk_dcerpcstat_cb(GtkAction *action _U_, gpointer user_data _U_)
 static stat_tap_ui dcerpcstat_ui = {
 	REGISTER_STAT_GROUP_GENERIC,
 	NULL,
-	"dcerpc,srt,",
+	"dcerpc,srt",
 	gtk_dcerpcstat_init,
 	-1,
 	0,

ui/gtk/rpc_stat.c

@@ -526,7 +526,7 @@ gtk_rpcstat_cb(GtkAction *action _U_, gpointer user_data _U_)
 static stat_tap_ui rpcstat_ui = {
 	REGISTER_STAT_GROUP_GENERIC,
 	NULL,
-	"rpc,srt,",
+	"rpc,srt",
 	gtk_rpcstat_init,
 	-1,
 	0,