NFC: Fix next target_idx type and rename for clarity

Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/nfc/nfc.h b/include/net/nfc/nfc.h
index 45f0563..f4f6950 100644
--- a/include/net/nfc/nfc.h
+++ b/include/net/nfc/nfc.h
@@ -89,7 +89,7 @@
 
 struct nfc_dev {
 	unsigned idx;
-	unsigned target_idx;
+	u32 target_next_idx;
 	struct nfc_target *targets;
 	int n_targets;
 	int targets_generation;