gofmt: apply gofmt -w src misc

Remove trailing whitespace in comments.
No other changes.

R=r
CC=golang-dev
https://golang.org/cl/6815053
diff --git a/src/pkg/syscall/zsysnum_linux_arm.go b/src/pkg/syscall/zsysnum_linux_arm.go
index 7f5d949..7068e4e 100644
--- a/src/pkg/syscall/zsysnum_linux_arm.go
+++ b/src/pkg/syscall/zsysnum_linux_arm.go
@@ -1,4 +1,4 @@
-// mksysnum_linux.pl 
+// mksysnum_linux.pl
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
 package syscall