The call to of_get_child_by_name returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.
Detected by coccinelle with the following warnings:
./drivers/pinctrl/pinctrl-st.c:1188:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 1175, but without a corresponding object release within this function.
./drivers/pinctrl/pinctrl-st.c:1188:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 1175, but without a corresponding object release within this function.
./drivers/pinctrl/pinctrl-st.c:1199:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 1175, but without a corresponding object release within this function.
./drivers/pinctrl/pinctrl-st.c:1199:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 1175, but without a corresponding object release within this function.