pprof: replace bits = bits + "..." to bits += "..." where bits is a string.

Change-Id: Ic77ebbdf2670b7fdf2c381cd1ba768624b07e57c
Reviewed-on: https://go-review.googlesource.com/c/141998
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

diff --git a/src/runtime/pprof/internal/profile/profile.go b/src/runtime/pprof/internal/profile/profile.go
index 863bd403a445d0c7857a67927b995262a01940a8..84e607e9a8ff0af7ba338e73ceea2bf865073b80 100644 (file)
--- a/src/runtime/pprof/internal/profile/profile.go
+++ b/src/runtime/pprof/internal/profile/profile.go
@@ -415,16 +415,16 @@ func (p *Profile) String() string {
        for _, m := range p.Mapping {
                bits := ""
                if m.HasFunctions {
-                       bits = bits + "[FN]"
+                       bits += "[FN]"
                }
                if m.HasFilenames {
-                       bits = bits + "[FL]"
+                       bits += "[FL]"
                }
                if m.HasLineNumbers {
-                       bits = bits + "[LN]"
+                       bits += "[LN]"
                }
                if m.HasInlineFrames {
-                       bits = bits + "[IN]"
+                       bits += "[IN]"
                }
                ss = append(ss, fmt.Sprintf("%d: %#x/%#x/%#x %s %s %s",
                        m.ID,