[gnome-settings-daemon] build: Fix --enable-rfkill configure switch

[Bastien Nocera <hadess src gnome org>]

commit 73c718b9ba6287de483312ad85f4dad0e4f97101
Author: Philip Withnall <withnall endlessm com>
Date:   Thu Feb 9 11:00:19 2017 +0000

    build: Fix --enable-rfkill configure switch
    
    There was an additional comma in the AC_ARG_ENABLE call, which meant
    that no action-if-given was provided, meaning that enable_rfkill would
    be enabled by default if the rfkill switch was not passed — but if it
    was passed, enable_rfkill would not be set at all and the plugin would
    always be disabled.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778383

 configure.ac |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a2fa53f..257bbb6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -391,9 +391,11 @@ AM_CONDITIONAL(BUILD_PRINT_NOTIFICATIONS, [test x"$enable_cups" = x"yes"])
 # Rfkill
 # ---------------------------------------------------------------------------
 
-AC_ARG_ENABLE(rfkill,
-              AS_HELP_STRING([--disable-rfkill], [disable rfkill support (default: enabled)]),,
-              enable_rfkill=yes, enabled_rfkill=no)
+AC_ARG_ENABLE([rfkill],
+              [AS_HELP_STRING([--disable-rfkill],
+                              [Disable rfkill support (default: enabled)])],
+              [enable_rfkill=$enableval],
+              [enable_rfkill=yes])
 
 if test x"$enable_rfkill" != x"no" ; then
   AC_CHECK_HEADERS([linux/rfkill.h],,