Staging: fbtft: fix header guard typo

drivers/staging/fbtft/internal.h header guard tests for
__LINUX_FBTFT__INTERNAL_H but then defines __LINUX_FBTFT_INTERNAL_H
(only 1 underscore) and uses the same name for the #endif comment.
Use the same name everywhere.
Signed-off-by: NNicolas Iooss <nicolas.iooss_linux@m4x.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fbtft/internal.h

@@ -13,7 +13,7 @@
  *
  */
 
-#ifndef __LINUX_FBTFT__INTERNAL_H
+#ifndef __LINUX_FBTFT_INTERNAL_H
 #define __LINUX_FBTFT_INTERNAL_H
 
 void fbtft_sysfs_init(struct fbtft_par *par);