[test] Minor, adjust usage

test/draw/hb-draw-all.c

diff --git a/test/draw/hb-draw-all.c b/test/draw/hb-draw-all.c
index 7284eeb..8874f19 100644
--- a/test/draw/hb-draw-all.c
+++ b/test/draw/hb-draw-all.c
@@ -5,7 +5,7 @@
 
 int main (int argc, char **argv)
 {
-  if (argc < 3)
+  if (argc < 2)
   {
     fprintf (stderr, "Usage: %s font-file [font-funcs] [wght]\n", argv[0]);
     return 1;

test/paint/hb-paint-all.c

diff --git a/test/paint/hb-paint-all.c b/test/paint/hb-paint-all.c
index a29e2ef..4f04fce 100644
--- a/test/paint/hb-paint-all.c
+++ b/test/paint/hb-paint-all.c
@@ -5,7 +5,7 @@
 
 int main (int argc, char **argv)
 {
-  if (argc < 3)
+  if (argc < 2)
   {
     fprintf (stderr, "Usage: %s font-file [font-funcs] [wght]\n", argv[0]);
     return 1;