[riot-notifications] [RIOT] shell: fix multicast pings (#4005)

[Oleg Hahm]

The fragments in the packetbuffer look weird to me:
```
packet buffer: first byte: 0x8088fc0, last byte: 0x808a7c0 (size: 6144)
~ unused: 0x8088fc0 (next: 0x80893f0, size: 1056) ~
================ chunk   0 (size:   16) ================
000000 86 dd 00 00 08 00 00 00 e0 10 4d cf 00 00 00 00
~ unused: 0x80893f0 (next: 0x8089490, size:  152) ~
================ chunk   1 (size:    8) ================
000000 08 00 00 00 08 00 00 00
~ unused: 0x8089490 (next: (nil), size: 4912) ~
```

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Reply to this email directly or view it on GitHub:
https://github.com/RIOT-OS/RIOT/pull/4005#issuecomment-144502814
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