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/sd.c b/drivers/mmc/core/sd.c
index 0a04a6e..c86588f 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -166,8 +166,6 @@
 	unsigned int scr_struct;
 	u32 resp[4];
 
-	BUG_ON(!mmc_card_sd(card));
-
 	resp[3] = card->raw_scr[1];
 	resp[2] = card->raw_scr[0];
 
@@ -300,7 +298,7 @@
 	unsigned int max_dtr;
 
 	BUG_ON(!host);
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	/*
 	 * Since we're changing the OCR value, we seem to
@@ -620,7 +618,7 @@
 	int err;
 
 	BUG_ON(!host);
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	mmc_attach_bus(host, &mmc_sd_ops);