mfd: core: Fix device reference leak in mfd_clone_cell

Make sure to drop the reference taken by bus_find_device_by_name()
before returning from mfd_clone_cell().

Fixes: a9bbba996302 ("mfd: add platform_device sharing support for mfd")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/mfd-core.c

@@ -399,6 +399,8 @@ int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
 					clones[i]);
 	}
 
+	put_device(dev);
+
 	return 0;
 }
 EXPORT_SYMBOL(mfd_clone_cell);