Fix format of nanobench result

bench/nanobench.cpp

Index: bench/nanobench.cpp
diff --git a/bench/nanobench.cpp b/bench/nanobench.cpp
index 452da1f083287fc80f5c9350207bf6c3294efc68..ff23be504caaab1cde44ec9b5c162d26b340ac82 100644
--- a/bench/nanobench.cpp
+++ b/bench/nanobench.cpp
@@ -587,7 +587,8 @@ int nanobench_main() {
     } else if (FLAGS_quiet) {
         SkDebugf("median\tbench\tconfig\n");
     } else {
-        SkDebugf("maxrss\tloops\tmin\tmedian\tmean\tmax\tstddev\tsamples\tconfig\tbench\n");
+        SkDebugf("maxrss\tloops\tmin\tmedian\tmean\tmax\tstddev\t%-*s\tconfig\tbench\n",
+                 FLAGS_samples, "samples");
     }
 
     SkTDArray<Config> configs;