sms.db: silence libdbi warnings on out-of-range index

Apparently, since libdbi 0.9.0 aka 0.9.0-5 on debian-testing, osmo-msc barfs
numerous libdbi warnings whenever a query rightfully returns no rows.

Trivially query whether there are any rows first by adding an inline wrap
function next_row().

Silenced:

  DDB <000d> ../../../../src/osmo-msc/src/libmsc/db.c:188 DBI: -6: An invalid or out-of-range index was passed to libdbi
  DDB <000d> ../../../src/libosmocore/src/backtrace.c:47 backtrace() returned 11 addresses
  DDB <000d> ../../../src/libosmocore/src/backtrace.c:57        /usr/local/bin/osmo-msc(+0xfb81) [0x555555563b81]
  DDB <000d> ../../../src/libosmocore/src/backtrace.c:57        /usr/lib/x86_64-linux-gnu/libdbi.so.1(_error_handler+0x99) [0x7ffff63f5c39]
  DDB <000d> ../../../src/libosmocore/src/backtrace.c:57        /usr/lib/x86_64-linux-gnu/libdbi.so.1(dbi_result_next_row+0x3d) [0x7ffff63f785d]
  DDB <000d> ../../../src/libosmocore/src/backtrace.c:57        /usr/local/bin/osmo-msc(+0x11172) [0x555555565172]
  DDB <000d> ../../../src/libosmocore/src/backtrace.c:57        /usr/local/bin/osmo-msc(+0x1e6bc) [0x5555555726bc]
  DDB <000d> ../../../src/libosmocore/src/backtrace.c:57        /usr/local/bin/osmo-msc(+0x1e7f6) [0x5555555727f6]
  DDB <000d> ../../../src/libosmocore/src/backtrace.c:57        /usr/local/bin/osmo-msc(+0x1f1d2) [0x5555555731d2]
  DDB <000d> ../../../src/libosmocore/src/backtrace.c:57        /usr/local/bin/osmo-msc(+0xbb86) [0x55555555fb86]
  DDB <000d> ../../../src/libosmocore/src/backtrace.c:57        /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1) [0x7ffff5cfe561]
  DDB <000d> ../../../src/libosmocore/src/backtrace.c:57        /usr/local/bin/osmo-msc(+0xbfba) [0x55555555ffba]

Related: OS#2667
Change-Id: Ib8993c8db171d1e845a6297deef137d18506cda3

0 files changed, 0 insertions, 0 deletions