rmmod: fix full path syntax

rmmod /system/modules/multitouch.ko
rmmod: delete_module '/multitouch' failed (errno 2)

Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>
diff --git a/toolbox/rmmod.c b/toolbox/rmmod.c
index 7e10c06..25257cc 100644
--- a/toolbox/rmmod.c
+++ b/toolbox/rmmod.c
@@ -25,6 +25,8 @@
 	modname = strrchr(argv[1], '/');
 	if (!modname)
 		modname = argv[1];
+	else modname++;
+
 	dot = strchr(argv[1], '.');
 	if (dot)
 		*dot = '\0';