asfdec: make nb_sub to be unsigned int

number of subpayloads should be always positive

Signed-off-by: Anton Khirnov <anton@khirnov.net>

diff --git a/libavformat/asfdec.c b/libavformat/asfdec.c
index 8b0d82a790044d6d72c8d9727c227d532a0309ae..6613ec69654b3f11caa3be5612a5112779e930bd 100644 (file)
--- a/libavformat/asfdec.c
+++ b/libavformat/asfdec.c
@@ -134,7 +134,7 @@ typedef struct ASFContext {
 
     // packet state
     uint64_t sub_left;  // subpayloads left or not
-    int nb_sub; // number of subpayloads read so far from the current ASF packet
+    unsigned int nb_sub; // number of subpayloads read so far from the current ASF packet
     uint16_t mult_sub_len; // total length of subpayloads array inside multiple payload
     uint64_t nb_mult_left; // multiple payloads left
     int return_subpayload;