nvme-print: introduce nvme_show_err() helper function

This handles the negative error code and the postive status code.
  Note: Fix also to handle the negative error for nvme_strerror().

Fixes: 4fb93ad ("nvme-cli: update error handling")
Signed-off-by: Tokunori Ikegami <[email protected]>

Author: ikegami-t

nvme-print.c

@@ -520,6 +520,16 @@ void nvme_show_status(int status)
 		ops->show_status(status);
 }
 
+int nvme_show_err(const char *msg, int err)
+{
+	if (err < 0)
+		nvme_show_error("%s: %s", msg, nvme_strerror(-err));
+	else if (err > 0)
+		nvme_show_status(err);
+
+	return err;
+}
+
 void nvme_show_opcode_status(int status, bool admin, __u8 opcode)
 {
 	struct print_ops *ops = nvme_print_ops(NORMAL);

nvme-print.h

@@ -159,6 +159,7 @@ struct print_ops *nvme_get_stdout_print_ops(nvme_print_flags_t flags);
 struct print_ops *nvme_get_binary_print_ops(nvme_print_flags_t flags);
 
 void nvme_show_status(int status);
+int nvme_show_err(const char *msg, int err);
 void nvme_show_opcode_status(int status, bool admin, __u8 opcode);
 void nvme_show_lba_status_info(__u64 result);
 void nvme_show_relatives(struct nvme_global_ctx *ctx, const char *name, nvme_print_flags_t flags);