runtime: gofmt all improperly formatted code

This change fixes incorrect formatting in mheap.go (the result of my
previous heap scavenging changes) and map_test.go.

Change-Id: I2963687504abdc4f0cdf2f0c558174b3bc0ed2df
Reviewed-on: https://go-review.googlesource.com/c/148977
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/runtime/mheap.go

@@ -903,7 +903,7 @@ HaveSpan:
 		// If s was scavenged, then t may be scavenged.
 		start, end := t.physPageBounds()
 		if s.scavenged && start < end {
-			memstats.heap_released += uint64(end-start)
+			memstats.heap_released += uint64(end - start)
 			t.scavenged = true
 		}
 		s.state = mSpanManual // prevent coalescing with s
@@ -1175,7 +1175,7 @@ func (h *mheap) scavengeAll(now, limit uint64) uintptr {
 	for t != nil {
 		s := t.spanKey
 		next := t.succ()
-		if (now-uint64(s.unusedsince)) > limit {
+		if (now - uint64(s.unusedsince)) > limit {
 			r := s.scavenge()
 			if r != 0 {
 				// If we ended up scavenging s, then remove it from unscav