devm_ioremap_resource() doesn't return NULL, it returns error pointers.

Fixes: df7e762d ("dmaengine: Add STM32 DMAMUX driver")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NPierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>