internal/fuzz: tiny refactor+fix

Change-Id: I8db9c31ead3e5905b7f9d1faed36555e8aaa00cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/358054
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
Reviewed-by: Julie Qiu <julie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
diff --git a/src/internal/fuzz/fuzz.go b/src/internal/fuzz/fuzz.go
index 5b3819b..5008927f 100644
--- a/src/internal/fuzz/fuzz.go
+++ b/src/internal/fuzz/fuzz.go
@@ -702,7 +702,7 @@
 			interestingTotalCount := int64(c.warmupInputCount-len(c.opts.Seed)) + c.interestingCount
 			fmt.Fprintf(c.opts.Log, "fuzz: elapsed: %s, execs: %d (%.0f/sec), new interesting: %d (total: %d)\n", c.elapsed(), c.count, rate, c.interestingCount, interestingTotalCount)
 		} else {
-			fmt.Fprintf(c.opts.Log, "fuzz: elapsed: %s, execs: %d (%.0f/sec)", c.elapsed(), c.count, rate)
+			fmt.Fprintf(c.opts.Log, "fuzz: elapsed: %s, execs: %d (%.0f/sec)\n", c.elapsed(), c.count, rate)
 		}
 	}
 	c.countLastLog = c.count
diff --git a/src/internal/fuzz/worker.go b/src/internal/fuzz/worker.go
index e3827b1..b36ebe2 100644
--- a/src/internal/fuzz/worker.go
+++ b/src/internal/fuzz/worker.go
@@ -1088,7 +1088,7 @@
 		wc.m.r.restore(mem.header().randState, mem.header().randInc)
 		if !args.Warmup {
 			// Only mutate the valuesOut if fuzzing actually occurred.
-			for i := int64(0); i < mem.header().count; i++ {
+			for i := int64(0); i < resp.Count; i++ {
 				wc.m.mutate(valuesOut, cap(mem.valueRef()))
 			}
 		}