efi_loader: do not add \ in efi_fs_from_name()

In the `efidebug boot add` command we do not want an unsolicited leading
backslash added to the file name.

There is no good reason to mark a loaded file with a backslash as absolute.
Anyway when reading files the file name will be interpreted as relative to
root directory of the device.

So let's get rid of this backslash.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index 98c36e7..53b40c8 100644
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -985,12 +985,7 @@
 	if (!path)
 		return EFI_SUCCESS;
 
-	if (!is_net) {
-		/* Add leading / to fs paths, because they're absolute */
-		snprintf(filename, sizeof(filename), "/%s", path);
-	} else {
-		snprintf(filename, sizeof(filename), "%s", path);
-	}
+	snprintf(filename, sizeof(filename), "%s", path);
 	/* DOS style file path: */
 	s = filename;
 	while ((s = strchr(s, '/')))