avcodec/sinewin_tablegen: Use better check in assert

There are no ff_sine_windows for 2^i, 0 <= i < 5, so one should check
for the index being >= 5.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/sinewin_tablegen.h

@@ -74,7 +74,7 @@ av_cold void AAC_RENAME(ff_sine_window_init)(INTFLOAT *window, int n) {
 }
 
 av_cold void AAC_RENAME(ff_init_ff_sine_windows)(int index) {
-    assert(index >= 0 && index < FF_ARRAY_ELEMS(AAC_RENAME(ff_sine_windows)));
+    assert(index >= 5 && index < FF_ARRAY_ELEMS(AAC_RENAME(ff_sine_windows)));
 #if !CONFIG_HARDCODED_TABLES
     AAC_RENAME(ff_sine_window_init)(AAC_RENAME(ff_sine_windows)[index], 1 << index);
 #endif