Replace (unsigned) short with (u)int16_t.

Bug: 112478838
Test: build with WITH_TIDY=1
Change-Id: I4b81e6287e72bce2d3cb67cacd6220d064818852
diff --git a/logd/LogBuffer.h b/logd/LogBuffer.h
index 0942987..774d4ab 100644
--- a/logd/LogBuffer.h
+++ b/logd/LogBuffer.h
@@ -115,7 +115,7 @@
     }
 
     int log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid,
-            const char* msg, unsigned short len) override;
+            const char* msg, uint16_t len) override;
     // lastTid is an optional context to help detect if the last previous
     // valid message was from the same source so we can differentiate chatty
     // filter types (identical or expired)