cli/command/container: NewRunCommand: slight cleanup of completion

- explicitly suppress unhandled errors
- remove names for unused arguments

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit eed0e5b02a)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/container/run.go

@@ -70,22 +70,13 @@ func NewRunCommand(dockerCli command.Cli) *cobra.Command {
 	command.AddTrustVerificationFlags(flags, &options.untrusted, dockerCli.ContentTrustEnabled())
 	copts = addFlags(flags)
 
-	cmd.RegisterFlagCompletionFunc(
-		"env",
-		func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
-			return os.Environ(), cobra.ShellCompDirectiveNoFileComp
-		},
-	)
-	cmd.RegisterFlagCompletionFunc(
-		"env-file",
-		func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
-			return nil, cobra.ShellCompDirectiveDefault
-		},
-	)
-	cmd.RegisterFlagCompletionFunc(
-		"network",
-		completion.NetworkNames(dockerCli),
-	)
+	_ = cmd.RegisterFlagCompletionFunc("env", func(*cobra.Command, []string, string) ([]string, cobra.ShellCompDirective) {
+		return os.Environ(), cobra.ShellCompDirectiveNoFileComp
+	})
+	_ = cmd.RegisterFlagCompletionFunc("env-file", func(*cobra.Command, []string, string) ([]string, cobra.ShellCompDirective) {
+		return nil, cobra.ShellCompDirectiveDefault
+	})
+	_ = cmd.RegisterFlagCompletionFunc("network", completion.NetworkNames(dockerCli))
 	return cmd
 }