test: fix gofmt error

hack/boilerplate/boilerplate.py

@@ -179,8 +179,8 @@ def get_regexs():
     # dates can be 2014, 2015, 2016, ..., CURRENT_YEAR, company holder names can be anything
     years = range(2014, date.today().year + 1)
     regexs["date"] = re.compile( '(%s)' % "|".join(map(lambda l: str(l), years)) )
-    # strip // +build \n\n build constraints
-    regexs["go_build_constraints"] = re.compile(r"^(// \+build.*\n)+\n", re.MULTILINE)
+    # strip // +build \n\n build and //go:build constraints
+    regexs["go_build_constraints"] = re.compile(r"^(//(go:build| \+build).*\n)+\n", re.MULTILINE)
     # strip #!.* from shell scripts
     regexs["shebang"] = re.compile(r"^(#!.*\n)\n*", re.MULTILINE)
     return regexs

pkg/mounter/safe_mounter_unix.go

@@ -1,3 +1,4 @@
+//go:build linux || darwin
 // +build linux darwin
 
 /*

pkg/mounter/safe_mounter_v1beta_windows.go

@@ -1,3 +1,4 @@
+//go:build windows
 // +build windows
 
 /*

pkg/mounter/safe_mounter_windows.go

@@ -1,3 +1,4 @@
+//go:build windows
 // +build windows
 
 /*

pkg/smb/smb_common_darwin.go

@@ -1,3 +1,4 @@
+//go:build darwin
 // +build darwin
 
 /*

pkg/smb/smb_common_linux.go

@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 /*

pkg/smb/smb_common_windows.go

@@ -1,3 +1,4 @@
+//go:build windows
 // +build windows
 
 /*