s3cmci: fix sparse errors from non-exported functions

Fix the following sparse errors by making the functions
static and fixing the check for host->base.

598:6: warning: symbol 's3cmci_dma_done_callback' was not declared. Should it be static?
744:6: warning: symbol 's3cmci_dma_setup' was not declared. Should it be static?
1209:20: warning: Using plain integer as NULL pointer

Signed-off-by: Ben Dooks <[e-mail]>
Signed-off-by: Pierre Ossman <[e-mail]>

drivers/mmc/host/s3cmci.c

···
 	return IRQ_HANDLED;
 }
 
-void s3cmci_dma_done_callback(struct s3c2410_dma_chan *dma_ch, void *buf_id,
-			      int size, enum s3c2410_dma_buffresult result)
+static void s3cmci_dma_done_callback(struct s3c2410_dma_chan *dma_ch,
+				     void *buf_id, int size,
+				     enum s3c2410_dma_buffresult result)
 {
 	struct s3cmci_host *host = buf_id;
 	unsigned long iflags;
···
 	mmc_request_done(host->mmc, mrq);
 }
 
-
-void s3cmci_dma_setup(struct s3cmci_host *host, enum s3c2410_dmasrc source)
+static void s3cmci_dma_setup(struct s3cmci_host *host,
+			     enum s3c2410_dmasrc source)
 {
 	static enum s3c2410_dmasrc last_source = -1;
 	static int setup_ok;
···
 	}
 
 	host->base = ioremap(host->mem->start, RESSIZE(host->mem));
-	if (host->base == 0) {
+	if (!host->base) {
 		dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
 		ret = -EINVAL;
 		goto probe_free_mem_region;