wav2swf memory leak

[lcatro]

Crash : https://raw.githubusercontent.com/lcatro/My_PoC/master/swftools/wav2swf_memory_corruption

Trigger : ./wav2swf swftools/wav2swf_memory_corruption

Crash Detail :

`
fuzzer@ub16x64:~/fuzzing/swftools/src$ ./wav2swf swftools/wav2swf_memory_corruption

=================================================================
==19388==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 46986 byte(s) in 1 object(s) allocated from:
#0 0x7f1f953cd602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
#1 0x438244 in wav_read (/home/fuzzer/fuzzing/swftools/src/wav2swf+0x438244)

Direct leak of 1152 byte(s) in 1 object(s) allocated from:
#0 0x7f1f953cd602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
#1 0x4027b6 in main (/home/fuzzer/fuzzing/swftools/src/wav2swf+0x4027b6)

Direct leak of 1123 byte(s) in 1 object(s) allocated from:
#0 0x7f1f953cd602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
#1 0x43866e in wav_convert2mono (/home/fuzzer/fuzzing/swftools/src/wav2swf+0x43866e)
#2 0x1f3f ()

SUMMARY: AddressSanitizer: 49261 byte(s) leaked in 3 allocation(s).
`