mtd: Remove a debug trace in mtdpart.c

Commit 2b6f0090a3 ("mtd: Check add_mtd_device() ret code") contained
a leftover of the debug session that led to this bug fix. Remove this
pr_info().

Fixes: 2b6f0090a3 ("mtd: Check add_mtd_device() ret code")
Signed-off-by: Boris Brezillon <bbrezillon@kernel.org>

drivers/mtd/mtdpart.c

@@ -632,7 +632,6 @@ err_remove_part:
 	mutex_unlock(&mtd_partitions_mutex);
 
 	free_partition(new);
-	pr_info("%s:%i\n", __func__, __LINE__);
 
 	return ret;
 }