gpiolib: fix HAVE_GPIO_LIB leftovers in asm-generic/gpio.h

commit 7444a72e ("gpiolib: allow user-selection")
removed HAVE_GPIO_LIB Kconfig symbol, but the header file still uses the
name [to confuse readers wrt #ifdef/#else/#endif location].

The real Kconfig symbol nowadays is CONFIG_GPIOLIB.
Signed-off-by: NAnton Vorontsov <cbouatmailru@gmail.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/asm-generic/gpio.h

@@ -210,7 +210,7 @@ extern void gpio_unexport(unsigned gpio);
 
 #endif	/* CONFIG_GPIO_SYSFS */
 
-#else	/* !CONFIG_HAVE_GPIO_LIB */
+#else	/* !CONFIG_GPIOLIB */
 
 static inline int gpio_is_valid(int number)
 {
@@ -239,7 +239,7 @@ static inline void gpio_set_value_cansleep(unsigned gpio, int value)
 	gpio_set_value(gpio, value);
 }
 
-#endif /* !CONFIG_HAVE_GPIO_LIB */
+#endif /* !CONFIG_GPIOLIB */
 
 #ifndef CONFIG_GPIO_SYSFS