Print one less newline at the end of bb_show_usage()

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index ba3d6e7..46849e4 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -130,7 +130,7 @@
 			full_write2_str(applet_name);
 			full_write2_str(" ");
 			full_write2_str(p);
-			full_write2_str("\n\n");
+			full_write2_str("\n");
 		}
 		if (ENABLE_FEATURE_CLEAN_UP)
 			dealloc_usage_messages((char*)usage_string);