udf: Remove unnecessary OOM messages

Per call site OOM messages are unnecessary.
k.alloc and v.alloc failures use dump_stack().

Signed-off-by: Joe Perches <[e-mail]>
Signed-off-by: Jan Kara <[e-mail]>

fs/udf/super.c

···
 	else
 		bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
 
-	if (bitmap == NULL) {
-		udf_err(sb, "Unable to allocate space for bitmap and %d buffer_head pointers\n",
-			nr_groups);
+	if (bitmap == NULL)
 		return NULL;
-	}
 
 	bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 	bitmap->s_nr_groups = nr_groups;