dmaengine: Make __dma_request_slave_channel_compat() name argument constant

Inline function __dma_request_slave_channel_compat() doesn't modify "name"
argument but passes it to dma_request_slave_channel() which already takes
it as a constant.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 1b866e9..3a732ac 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -1229,7 +1229,7 @@
 static inline struct dma_chan
 *__dma_request_slave_channel_compat(const dma_cap_mask_t *mask,
 				  dma_filter_fn fn, void *fn_param,
-				  struct device *dev, char *name)
+				  struct device *dev, const char *name)
 {
 	struct dma_chan *chan;