left-pad numbers with 0s instead of right-justifying with spaces...

Change-Id: Ie2f0c5bffa17f81214c969abff93760d0cb83506
diff --git a/aos/common/logging/logging_printf_formats.h b/aos/common/logging/logging_printf_formats.h
index f7ab7bd..0bf253c 100644
--- a/aos/common/logging/logging_printf_formats.h
+++ b/aos/common/logging/logging_printf_formats.h
@@ -10,7 +10,7 @@
 // logging_impl.cc.
 
 #define AOS_TIME_FORMAT \
-  "%010" PRId32 ".%-" STRINGIFY(AOS_TIME_NSECONDS_DIGITS) PRId32 "s"
+  "%010" PRId32 ".%0" STRINGIFY(AOS_TIME_NSECONDS_DIGITS) PRId32 "s"
 #define AOS_TIME_ARGS(sec, nsec)                      \
   sec, (nsec + (AOS_TIME_NSECONDS_DENOMINATOR / 2)) / \
       AOS_TIME_NSECONDS_DENOMINATOR