Documentation: fix blackfin gptimers-example build errors

From: Randy Dunlap <[email protected]>

Don't build the blackfin gptimers-example module when BFIN_GPTIMERS is not enabled. Allow the build when BFIN_GPTIMERS is =y or =m.

I believe that this patch fixes these build errors, but I don't have a build environment to test this.

ERROR: "disable_gptimers" [Documentation/blackfin/gptimers-example.ko] undefined!
ERROR: "enable_gptimers" [Documentation/blackfin/gptimers-example.ko] undefined!
ERROR: "set_gptimer_config" [Documentation/blackfin/gptimers-example.ko] undefined!
ERROR: "clear_gptimer_intr" [Documentation/blackfin/gptimers-example.ko] undefined!
ERROR: "get_gptimer_period" [Documentation/blackfin/gptimers-example.ko] undefined!
ERROR: "get_gptimer_pwidth" [Documentation/blackfin/gptimers-example.ko] undefined!
ERROR: "get_gptimer_intr" [Documentation/blackfin/gptimers-example.ko] undefined!

---
 Documentation/blackfin/Makefile |    2 ++
 1 file changed, 2 insertions(+)

@@ -1,3 +1,5 @@
 ifneq ($(CONFIG_BLACKFIN),)
+ifneq ($(CONFIG_BFIN_GPTIMERS,)
 obj-m := gptimers-example.o
 endif
+endif

Applied to the docs tree, thanks.

jon