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opus_decoder_fuzzer: limit the number of decodes to avoid timeout

--- a/tests/opus_decode_fuzzer.c

+++ b/tests/opus_decode_fuzzer.c

@@ -40,6 +40,8 @@

 /* 4 bytes: packet length, 4 bytes: encoder final range */

 #define SETUP_BYTE_COUNT 8

+#define MAX_DECODES 12

+

 typedef struct {

     int fs;

     int channels;

@@ -66,6 +68,7 @@

     TocInfo toc;

     int i = 0;

     int err = OPUS_OK;

+    int num_decodes = 0;

     /* Not enough data to setup the decoder (+1 for the ToC) */

     if (size < SETUP_BYTE_COUNT + 1) {

@@ -82,7 +85,7 @@

     pcm = (opus_int16*) malloc(sizeof(*pcm) * MAX_FRAME_SAMP * toc.channels);

-    while (i + SETUP_BYTE_COUNT < size) {

+    while (i + SETUP_BYTE_COUNT < size && num_decodes++ < MAX_DECODES) {

         int len, fec;

         len = (opus_uint32) data[i    ] << 24 |