logd: liblog: logcat: switch to android_log_clockid()

android_log_timestamp returns the property leading letter,
it is better to return a clockid_t with android_log_clockid()

Bug: 23668800
Change-Id: I3c4e3e6b87f6676950797f1f0e203b44c542ed43
diff --git a/liblog/logprint.c b/liblog/logprint.c
index ebf9786..ad52a81 100644
--- a/liblog/logprint.c
+++ b/liblog/logprint.c
@@ -203,7 +203,7 @@
     p_ret->year_output = false;
     p_ret->zone_output = false;
     p_ret->epoch_output = false;
-    p_ret->monotonic_output = android_log_timestamp() == 'm';
+    p_ret->monotonic_output = android_log_clockid() == CLOCK_MONOTONIC;
 
     return p_ret;
 }
@@ -1262,7 +1262,7 @@
     nsec = entry->tv_nsec;
     if (p_format->monotonic_output) {
         // prevent convertMonotonic from being called if logd is monotonic
-        if (android_log_timestamp() != 'm') {
+        if (android_log_clockid() != CLOCK_MONOTONIC) {
             struct timespec time;
             convertMonotonic(&time, entry);
             now = time.tv_sec;