gprs: fix T3186 encoding in Sysinfo 13

The timer T3186, which is described in 3GPP TS 44.060, is using 3
bits of the si13 mac block. This requires special encoding. In the
case of T3186, the value is encoded by the formula: bits = t/500-1.
Our implementation uses the formula bits=t/500, which is incorrect.

Change-Id: Ifd340c536cff2d1c4b1b3677a358ea95438801eb
1 file changed
tree: c1902dd81a5b705f784b8b5c6745d5e51c4e45d7
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore
  5. .gitreview
  6. .mailmap