contrib/fs-idmap: Dont use log, just print to stderr

Now that all the code is one function, we only print twice to stderr. Is
simpler to just print to stderr instead of logging and having also the
timestamp (that we can remove, but it is still more work to do).

Signed-off-by: Rodrigo Campos <[email protected]>

Author: rata

contrib/cmd/fs-idmap/fs-idmap.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"log"
 	"os"
 	"os/exec"
 	"syscall"
@@ -12,11 +11,13 @@ import (
 
 func main() {
 	if len(os.Args) != 2 {
-		log.Fatalf("usage: %s path_to_mount_set_attr", os.Args[0])
+		fmt.Fprintln(os.Stderr, "usage:", os.Args[0], "path_to_mount_set_attr")
+		os.Exit(1)
 	}
 	src := os.Args[1]
 	if err := supportsIDMap(src); err != nil {
-		log.Fatalf("fatal error: %v", err)
+		fmt.Fprintln(os.Stderr, "fatal error:", err)
+		os.Exit(1)
 	}
 }