Don't pass local stack addresses to callers!

[fdgonthier]

It's kind of a miracle this worked at all:

rinasense/components/Enrollment/SerdesMsg.c

Line 320 in 0c53686

uint8_t *pucBuffer[1500];

This allocates a large buffer on the stack, which is alright on its own, but then the address of this buffer is returned to the caller:

https://github.com/esmaxness/rinasense/blob/ee1163fa9967cd4c56704147991c7bbde73afcbe/components/Enrollment/SerdesMsg.c#L377

This is a big NO, and Valgrind is freaking out, justifiably so:

==86136== Thread 1:
==86136== Invalid read of size 8
==86136==    at 0x484A345: memmove (vg_replace_strmem.c:1382)
==86136==    by 0x486E367: prvRibdEncodeCDAP (Ribd.c:524)
==86136==    by 0x486FDB9: xRibdSendRequest (Ribd.c:1154)
==86136==    by 0x486953A: vFlowAllocatorFlowRequest (FlowAllocator.c:290)
==86136==    by 0x48707E1: prvConnect (RINA_API.c:316)
==86136==    by 0x48708AF: RINA_flow_alloc (RINA_API.c:352)
==86136==    by 0x10A4A4: main (test_linux.c:35)
==86136==  Address 0x1ffeffc870 is on thread 1's stack
==86136==  12328 bytes below stack pointer
==86136== 
==86136== Invalid read of size 8
==86136==    at 0x484A35F: memmove (vg_replace_strmem.c:1382)
==86136==    by 0x486E367: prvRibdEncodeCDAP (Ribd.c:524)
==86136==    by 0x486FDB9: xRibdSendRequest (Ribd.c:1154)
...

The stack buffer is also too big to deal with for Arduino so I need to change this code.