btle_ll.c: Initialize variable "offset" before it's used
btle_ll.c: Initialize variable "offset" before it's used

The variable "offset" gets configured if it's not the first data packet,
but gets used even on the first data packet.

common/btle_ll.c: In function 'connected_communicate':
common/btle_ll.c:729:15: error: 'offset' may be used uninitialized
in this function [-Werror=maybe-uninitialized]

This does not change the size of any ec.*.flat file.

BRANCH=none
BUG=none
TEST=build succeeds under GCC 4.9.2, 5.3, and 6.2

Change-Id: Ib3882aab3e081afc4b00dc02b002ba4c590cb0f9
Signed-off-by: Martin Roth <79230511ccf79da3f7e9e82dbcc9c1ec2f734fa0@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/403500
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec