Fix: flt.lttng-utils.debug-info: bin-info.c: Dereferencing null pointer

Fix: flt.lttng-utils.debug-info: bin-info.c: Dereferencing null pointer

Coverity reported the following:
  CID 1401211 (#1 of 1): Dereference after null check (FORWARD_NULL)4.
  var_deref_op: Dereferencing null pointer bin.

Reported-by: Coverity - 1401211 Dereference after null check (FORWARD_NULL)
Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Change-Id: I66c3dc42305b1c14a5567141274249c6e6b10082
Reviewed-on: https://review.lttng.org/c/babeltrace/+/2050
Tested-by: jenkins <jenkins@lttng.org>
Reviewed-by: Simon Marchi <simon.marchi@efficios.com>