[PATCH] [gdb/testsuite] Fix device index in gdb.rocm/addr-bp-gpu-no-deb-info.exp

[Luis Machado <luis.machado@amd.com>]

On a system with a single GPU, I spotted this test failing. The environment
variable ROCR_VISIBLE_DEVICES can be a bit misleading, as it actually expects
a list of device id's as opposed to a literal number of devices to make
visible.

This test sets it to 1, which is the second GPU on the system. As a result,
systems with a single GPU will have no visible GPU's and the test will FAIL.

Set ROCR_VISIBLE_DEVICES to 0 to make use of the first GPU on the system.
---
 gdb/testsuite/gdb.rocm/addr-bp-gpu-no-deb-info.exp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/gdb/testsuite/gdb.rocm/addr-bp-gpu-no-deb-info.exp b/gdb/testsuite/gdb.rocm/addr-bp-gpu-no-deb-info.exp
index be459673dc9..2719f0d8b13 100644
--- a/gdb/testsuite/gdb.rocm/addr-bp-gpu-no-deb-info.exp
+++ b/gdb/testsuite/gdb.rocm/addr-bp-gpu-no-deb-info.exp
@@ -28,9 +28,10 @@ if {[build_executable "failed to prepare" $testfile $srcfile {hip}]} {
 
 clean_restart $::testfile
 
-# We may have multiple GPUs, resulting in many possible locations. This is
-# needed to ensure we get a single address to break on.
-gdb_test_no_output "set environment ROCR_VISIBLE_DEVICES=1"
+# We may have multiple GPUs, resulting in many possible locations.  This is
+# needed to ensure we get a single address to break on, so make device 0 the
+# only visible one.
+gdb_test_no_output "set environment ROCR_VISIBLE_DEVICES=0"
 
 # Make the HIP runtime load all the GPU code objects during initialization.
 gdb_test_no_output "set environment HIP_ENABLE_DEFERRED_LOADING=0"
-- 
2.43.0