mmc: replace BUG_ON with WARN_ON

Replace all cases of BUG_ON with WARN_ON where there is a chance
(with varying degrees of slim) that the kernel can continue without
incidence.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c
index 01daee9..8843a4c 100644
--- a/drivers/mmc/core/sdio_irq.c
+++ b/drivers/mmc/core/sdio_irq.c
@@ -125,7 +125,7 @@
 {
 	struct mmc_host *host = card->host;
 
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	if (!host->sdio_irqs++) {
 		atomic_set(&host->sdio_irq_thread_abort, 0);
@@ -145,7 +145,7 @@
 {
 	struct mmc_host *host = card->host;
 
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 	BUG_ON(host->sdio_irqs < 1);
 
 	if (!--host->sdio_irqs) {