uprobes: Fix misleading log entry

There don't have any 'r' prefix in uprobe event naming, remove it.

Signed-off-by: Jovi Zhang <bookjovi@gmail.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 03003cd..f3c3811 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -189,7 +189,7 @@
 	if (argv[0][0] == '-')
 		is_delete = true;
 	else if (argv[0][0] != 'p') {
-		pr_info("Probe definition must be started with 'p', 'r' or" " '-'.\n");
+		pr_info("Probe definition must be started with 'p' or '-'.\n");
 		return -EINVAL;
 	}