Revert "gpiolib: annotate gpio-intialization with __must_check"

This reverts commit 0fdae42d361bbb431ca0ab0efed5126a94821177, which
wasn't really supposed to go in, and causes lots of annoying warnings.

Quoth Andrew:
  "Complete brainfart - I meant to drop that patch ages ago."

Quoth Greg:
  "Ick, yeah, that patch isn't ok to go in as-is, all of the callers
   need to be fixed up first, which is what I thought we had agreed on..."

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Greg KH <greg@kroah.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index f79d67f..4b47ed9 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -30,7 +30,7 @@
 	return 0;
 }
 
-static inline int __must_check gpio_request(unsigned gpio, const char *label)
+static inline int gpio_request(unsigned gpio, const char *label)
 {
 	return -ENOSYS;
 }
@@ -62,12 +62,12 @@
 	WARN_ON(1);
 }
 
-static inline int __must_check gpio_direction_input(unsigned gpio)
+static inline int gpio_direction_input(unsigned gpio)
 {
 	return -ENOSYS;
 }
 
-static inline int __must_check gpio_direction_output(unsigned gpio, int value)
+static inline int gpio_direction_output(unsigned gpio, int value)
 {
 	return -ENOSYS;
 }