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_func.h b/include/linux/mmc/sdio_func.h
index 31baaf8..50f0bc9 100644
--- a/include/linux/mmc/sdio_func.h
+++ b/include/linux/mmc/sdio_func.h
@@ -9,8 +9,8 @@
  * your option) any later version.
  */
 
-#ifndef MMC_SDIO_FUNC_H
-#define MMC_SDIO_FUNC_H
+#ifndef LINUX_MMC_SDIO_FUNC_H
+#define LINUX_MMC_SDIO_FUNC_H
 
 #include <linux/device.h>
 #include <linux/mod_devicetable.h>
@@ -161,5 +161,4 @@
 extern mmc_pm_flag_t sdio_get_host_pm_caps(struct sdio_func *func);
 extern int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags);
 
-#endif
-
+#endif /* LINUX_MMC_SDIO_FUNC_H */