gpio fixes for v5.17-rc2

- fix a bug with hogs not being set-up in gpio-sim when user-space sets the
   chip label to an empty string
 - include the gpio-sim documentation in the index
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Merge tag 'gpio-fixes-for-v5.17-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

Pull gpio fixes from Bartosz Golaszewski:
 "Two fixes for the gpio-simulator:

   - fix a bug with hogs not being set-up in gpio-sim when user-space
     sets the chip label to an empty string

   - include the gpio-sim documentation in the index"

* tag 'gpio-fixes-for-v5.17-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  gpio: sim: add doc file to index file
  gpio: sim: check the label length when setting up device properties

Documentation/admin-guide/gpio/index.rst

@@ -10,6 +10,7 @@ gpio
     gpio-aggregator
     sysfs
     gpio-mockup
+    gpio-sim
 
 .. only::  subproject and html
 

drivers/gpio/gpio-sim.c

@@ -816,7 +816,7 @@ gpio_sim_make_bank_swnode(struct gpio_sim_bank *bank,
 
 	properties[prop_idx++] = PROPERTY_ENTRY_U32("ngpios", bank->num_lines);
 
-	if (bank->label)
+	if (bank->label && (strlen(bank->label) > 0))
 		properties[prop_idx++] = PROPERTY_ENTRY_STRING("gpio-sim,label",
 							       bank->label);