dmaengine: stm32-mdma: initialize m2m_hw_period and ccr to fix warnings

[ Upstream commit aaf3bc0 ]

m2m_hw_period is initialized only when chan_config->m2m_hw is true. This
triggers a warning:
‘m2m_hw_period’ may be used uninitialized [-Wmaybe-uninitialized]
Although m2m_hw_period is only used when chan_config->m2m_hw is true and
ignored otherwise, initialize it unconditionally to 0.

ccr is initialized by stm32_mdma_set_xfer_param() when the sg list is not
empty. This triggers a warning:
‘ccr’ may be used uninitialized [-Wmaybe-uninitialized]
Indeed, it could be used uninitialized if the sg list is empty. Initialize
it to 0.

Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Reviewed-by: Clément Le Goffic <legoffic.clement@gmail.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://patch.msgid.link/20251217-mdma_warnings_fix-v2-1-340200e0bb55@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Upsylonbare

drivers/dma/stm32-mdma.c

@@ -732,7 +732,7 @@ static int stm32_mdma_setup_xfer(struct stm32_mdma_chan *chan,
 	struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
 	struct scatterlist *sg;
 	dma_addr_t src_addr, dst_addr;
-	u32 m2m_hw_period, ccr, ctcr, ctbr;
+	u32 m2m_hw_period = 0, ccr = 0, ctcr, ctbr;
 	int i, ret = 0;
 
 	if (chan_config->m2m_hw)