go mod: switch back to mainline go-fuse

Change was merged:
hanwen/go-fuse@a90e1f4

Done using:

$ go mod edit -dropreplace github.com/hanwen/go-fuse/v2
$ go get github.com/hanwen/go-fuse/v2@master
go: downloading github.com/hanwen/go-fuse/v2 v2.1.1-0.20210423170155-a90e1f463c3f
go get: upgraded github.com/hanwen/go-fuse/v2 v2.0.4-0.20210125162859-8e0bbdb16cb7 => v2.1.1-0.20210423170155-a90e1f463c3f

Related: #549

go.mod

@@ -3,7 +3,7 @@ module github.com/rfjakob/gocryptfs
 go 1.13
 
 require (
-	github.com/hanwen/go-fuse/v2 v2.0.4-0.20210125162859-8e0bbdb16cb7
+	github.com/hanwen/go-fuse/v2 v2.1.1-0.20210423170155-a90e1f463c3f
 	github.com/jacobsa/crypto v0.0.0-20190317225127-9f44e2d11115
 	github.com/jacobsa/oglematchers v0.0.0-20150720000706-141901ea67cd // indirect
 	github.com/jacobsa/oglemock v0.0.0-20150831005832-e94d794d06ff // indirect
@@ -17,5 +17,3 @@ require (
 	golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e // indirect
 	golang.org/x/sys v0.0.0-20200501145240-bc7a7d42d5c3
 )
-
-replace github.com/hanwen/go-fuse/v2 => github.com/rfjakob/go-fuse/v2 v2.0.4-0.20210327175606-13a195d20342

go.sum

@@ -2,6 +2,8 @@ github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/hanwen/go-fuse v1.0.0 h1:GxS9Zrn6c35/BnfiVsZVWmsG803xwE7eVRDvcf/BEVc=
 github.com/hanwen/go-fuse v1.0.0/go.mod h1:unqXarDXqzAk0rt98O2tVndEPIpUgLD9+rwFisZH3Ok=
+github.com/hanwen/go-fuse/v2 v2.1.1-0.20210423170155-a90e1f463c3f h1:fgjW2RVvUbinqh+Qq8zRf+yHmS08Uis35JcVwGbqk18=
+github.com/hanwen/go-fuse/v2 v2.1.1-0.20210423170155-a90e1f463c3f/go.mod h1:oRyA5eK+pvJyv5otpO/DgccS8y/RvYMaO00GgRLGryc=
 github.com/jacobsa/crypto v0.0.0-20190317225127-9f44e2d11115 h1:YuDUUFNM21CAbyPOpOP8BicaTD/0klJEKt5p8yuw+uY=
 github.com/jacobsa/crypto v0.0.0-20190317225127-9f44e2d11115/go.mod h1:LadVJg0XuawGk+8L1rYnIED8451UyNxEMdTWCEt5kmU=
 github.com/jacobsa/oglematchers v0.0.0-20150720000706-141901ea67cd h1:9GCSedGjMcLZCrusBZuo4tyKLpKUPenUUqi34AkuFmA=
@@ -20,8 +22,6 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rfjakob/eme v1.1.1 h1:t+CgvcOn+eDvj2xdglxsSnkgg8LM8jwdxnV7OnsrTn0=
 github.com/rfjakob/eme v1.1.1/go.mod h1:U2bmx0hDj8EyDdcxmD5t3XHDnBFnyNNc22n1R4008eM=
-github.com/rfjakob/go-fuse/v2 v2.0.4-0.20210327175606-13a195d20342 h1:IgNPMxwhljOzY3oEIx5d/zZp5k7Dfoyq/LqGVpEqu5s=
-github.com/rfjakob/go-fuse/v2 v2.0.4-0.20210327175606-13a195d20342/go.mod h1:oRyA5eK+pvJyv5otpO/DgccS8y/RvYMaO00GgRLGryc=
 github.com/sabhiram/go-gitignore v0.0.0-20180611051255-d3107576ba94 h1:G04eS0JkAIVZfaJLjla9dNxkJCPiKIGZlw9AfOhzOD0=
 github.com/sabhiram/go-gitignore v0.0.0-20180611051255-d3107576ba94/go.mod h1:b18R55ulyQ/h3RaWyloPyER7fWQVZvimKKhnI5OfrJQ=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=