scripts/gen_nvme.sh: make bdfs var local to a function

No need to keep "bdfs" variable as global variable.

Signed-off-by: Karol Latecki <karol.latecki@intel.com>
Change-Id: I655ed9f1514f13a6460292c1298ef08f904157fa
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/8774
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Paul Luse <paul.e.luse@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Pawel Piatek <pawelx.piatek@intel.com>

scripts/gen_nvme.sh

@@ -19,6 +19,9 @@ function usage() {
 
 function create_json_config() {
 	local bdev_json_cfg=()
+	local bdfs=()
+
+	bdfs=($(nvme_in_userspace))
 
 	for i in "${!bdfs[@]}"; do
 		bdev_json_cfg+=("$(
@@ -70,8 +73,6 @@ while getopts 'h-:' optchar; do
 	esac
 done
 
-bdfs=($(nvme_in_userspace))
-
 if [[ $gen_subsystems == true ]]; then
 	create_json_config_with_subsystems
 else