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iface-modem-firmware: Initialize context to null

Frédéric Martinsons requested to merge fmartinsons/ModemManager:fm/dangling-ptr-in-firmware into master

Without setting memory to NULL it is possible that ctx->list point to an unitialized pointer and trig a segfault when we free it (for example when the firmware list is not supported)

I came into this when issuing mmcli -m any --firmware-list with a not capable modem.

Signed-off-by: Frederic Martinsons frederic.martinsons@sigfox.com

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