Zoom: fix heap-buffer-overflow #2621
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```
=================================================================
==30923==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x50400023cc34 at pc 0x591f8b5dd546 bp 0x7ffe5ffc3530 sp 0x7ffe5ffc3528
READ of size 1 at 0x50400023cc34 thread T0
#0 0x591f8b5dd545 in is_sfu_5 /home/ivan/svnrepos/nDPI/src/lib/protocols/zoom.c:146:6
ntop#1 0x591f8b5dda11 in zoom_search_again /home/ivan/svnrepos/nDPI/src/lib/protocols/zoom.c:166:6
ntop#2 0x591f8b22182f in ndpi_process_extra_packet /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:8156:9
ntop#3 0x591f8b236f88 in ndpi_internal_detection_process_packet /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:8793:5
```
Found by oss-fuzz
See: https://issues.oss-fuzz.com/issues/379072455
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Found by oss-fuzz
See: https://issues.oss-fuzz.com/issues/379072455