dev: fix govet.nilness lint issues (#4373)

Co-authored-by: Fernandez Ludovic <ldez@users.noreply.github.com>

.golangci.yml

@@ -52,7 +52,6 @@ linters-settings:
       - strings.SplitN
 
   govet:
-    check-shadowing: true
     settings:
       printf:
         funcs:
@@ -60,6 +59,9 @@ linters-settings:
           - (github.com/golangci/golangci-lint/pkg/logutils.Log).Warnf
           - (github.com/golangci/golangci-lint/pkg/logutils.Log).Errorf
           - (github.com/golangci/golangci-lint/pkg/logutils.Log).Fatalf
+    enable:
+      - nilness
+      - shadow
   errorlint:
     asserts: false
   lll:

pkg/lint/lintersdb/manager.go

@@ -236,25 +236,22 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 		wrapcheckCfg = &m.cfg.LintersSettings.Wrapcheck
 		wslCfg = &m.cfg.LintersSettings.WSL
 
-		if govetCfg != nil {
 		govetCfg.Go = m.cfg.Run.Go
-		}
 
-		if gocriticCfg != nil {
 		gocriticCfg.Go = trimGoVersion(m.cfg.Run.Go)
-		}
 
-		if gofumptCfg != nil && gofumptCfg.LangVersion == "" {
+		if gofumptCfg.LangVersion == "" {
 			gofumptCfg.LangVersion = m.cfg.Run.Go
 		}
 
-		if staticcheckCfg != nil && staticcheckCfg.GoVersion == "" {
+		// staticcheck related linters.
+		if staticcheckCfg.GoVersion == "" {
 			staticcheckCfg.GoVersion = trimGoVersion(m.cfg.Run.Go)
 		}
-		if gosimpleCfg != nil && gosimpleCfg.GoVersion == "" {
+		if gosimpleCfg.GoVersion == "" {
 			gosimpleCfg.GoVersion = trimGoVersion(m.cfg.Run.Go)
 		}
-		if stylecheckCfg != nil && stylecheckCfg.GoVersion != "" {
+		if stylecheckCfg.GoVersion != "" {
 			stylecheckCfg.GoVersion = trimGoVersion(m.cfg.Run.Go)
 		}
 	}