mmc: Standardize header file inclusion checks.

Standardize the checks for multiple MMC header file inclusion,
including adding comments to terminating #endif's, and fixing
one incorrect comment.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/include/linux/mmc/sdio_ids.h b/include/linux/mmc/sdio_ids.h
index a36ab3b..9f03fee 100644
--- a/include/linux/mmc/sdio_ids.h
+++ b/include/linux/mmc/sdio_ids.h
@@ -2,8 +2,8 @@
  * SDIO Classes, Interface Types, Manufacturer IDs, etc.
  */
 
-#ifndef MMC_SDIO_IDS_H
-#define MMC_SDIO_IDS_H
+#ifndef LINUX_MMC_SDIO_IDS_H
+#define LINUX_MMC_SDIO_IDS_H
 
 /*
  * Standard SDIO Function Interfaces
@@ -44,4 +44,4 @@
 #define SDIO_DEVICE_ID_SIANO_NOVA_A0		0x1100
 #define SDIO_DEVICE_ID_SIANO_STELLAR 		0x5347
 
-#endif
+#endif /* LINUX_MMC_SDIO_IDS_H */