unix: fix misspellings

Change-Id: I4e1facc318d87fdd2abca1de040fdcb25680339e
GitHub-Last-Rev: bfebe23528
GitHub-Pull-Request: golang/sys#30
Reviewed-on: https://go-review.googlesource.com/c/159597
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

unix/syscall_aix.go

@@ -227,7 +227,7 @@ func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
 
 		// Some versions of AIX have a bug in getsockname (see IV78655).
 		// We can't rely on sa.Len being set correctly.
-		n := SizeofSockaddrUnix - 3 // substract leading Family, Len, terminating NUL.
+		n := SizeofSockaddrUnix - 3 // subtract leading Family, Len, terminating NUL.
 		for i := 0; i < n; i++ {
 			if pp.Path[i] == 0 {
 				n = i

unix/syscall_unix_test.go

@@ -642,7 +642,7 @@ func TestRenameat(t *testing.T) {
 
 	_, err = os.Stat(from)
 	if err == nil {
-		t.Errorf("Renameat: stat of renamed file %q unexpectedly suceeded", from)
+		t.Errorf("Renameat: stat of renamed file %q unexpectedly succeeded", from)
 	}
 }