`v2c` helper function returns -1 on error, hovewer its return type was
char - which may cause an overflow situation on architectures where char
is interpreted as unsigned char, which was reported by the CI.
The return type has been changed to signed char.
Signed-off-by: Blachut, Bartosz <bartosz.blachut@intel.com>
Change-Id: I84f5784b2de7d681f78c69b5f3646e851e8dee88
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/14273
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Shuhei Matsumoto <smatsumoto@nvidia.com>
Reviewed-by: Aleksey Marchuk <alexeymar@nvidia.com>
Reviewed-by: Jacek Kalwas <jacek.kalwas@intel.com>
1a24dc8fef