g722dec: Change bits_per_codeword to the right option type

This isn't a set of flags but just a plain integer in the range
6-8.
Signed-off-by: Martin Storsjö <martin@martin.st>

libavcodec/g722dec.c

@@ -44,7 +44,7 @@
 #define OFFSET(x) offsetof(G722Context, x)
 #define AD AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM
 static const AVOption options[] = {
-    { "bits_per_codeword", "Bits per G722 codeword", OFFSET(bits_per_codeword), AV_OPT_TYPE_FLAGS, { .i64 = 8 }, 6, 8, AD },
+    { "bits_per_codeword", "Bits per G722 codeword", OFFSET(bits_per_codeword), AV_OPT_TYPE_INT, { .i64 = 8 }, 6, 8, AD },
     { NULL }
 };