UBIFS: Missing offset relocation for compressor 'none'

On systems where U-Boot is linked to another address than it really lays
(e.g. backup image), calls via function pointers must be fixed with a
'+= gd->reloc_off'.
This was not done for none_compr in ubifs_compressors_init() what leads
to system crash on ubifsmount command.

Signed-off-by: Michael Lawnick <ml.lawnick@gmx.de>
Acked-by: Stefan Roese <sr@denx.de>

fs/ubifs/ubifs.c

@@ -147,7 +147,10 @@ int __init ubifs_compressors_init(void)
 	if (err)
 		return err;
 
-	ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
+	err = compr_init(&none_compr);
+	if (err)
+		return err;
+
 	return 0;
 }