cfg80211: fix spelling mistake: "uknown" -> "unknown"

Trivial fix to spelling mistake in pr_debug message text

Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Johannes Berg <[e-mail]>

net/wireless/reg.c

···
 	case NL80211_DFS_JP:
 		return true;
 	default:
-		pr_debug("Ignoring uknown DFS master region: %d\n", dfs_region);
+		pr_debug("Ignoring unknown DFS master region: %d\n", dfs_region);
 		return false;
 	}
 }