mmc: mmc_spi: Fix mmc_spi_dma_alloc() return type for !HAS_DMA

If CONFIG_NO_DMA=y (e.g. Sun-3 allmodconfig):

    drivers/mmc/host/mmc_spi.c:1323:15: warning: return type defaults to ‘int’ [-Wreturn-type]
     static inline mmc_spi_dma_alloc(struct mmc_spi_host *host) { return 0; }
		   ^~~~~~~~~~~~~~~~~

Fix this by adding the missing return type.

Fixes: a395acf0 ("mmc: mmc_spi: Allow the driver to be built when CONFIG_HAS_DMA is unset")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20200914094243.3912-1-geert@linux-m68k.orgSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/mmc_spi.c

@@ -1320,7 +1320,7 @@ static void mmc_spi_dma_free(struct mmc_spi_host *host)
 			 DMA_BIDIRECTIONAL);
 }
 #else
-static inline mmc_spi_dma_alloc(struct mmc_spi_host *host) { return 0; }
+static inline int mmc_spi_dma_alloc(struct mmc_spi_host *host) { return 0; }
 static inline void mmc_spi_dma_free(struct mmc_spi_host *host) {}
 #endif