GDBusConnection: propagate error correctly if flags are inappropriate
GDBusConnection: propagate error correctly if flags are inappropriate

Previously, this would fail the assertion
"connection->initialization_error != NULL" after the label "out".

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=665067
Signed-off-by: Simon McVittie <2b470b34502dbf3ba4bcc04ea7e64f4e0e104f33@collabora.co.uk>
Reviewed-by: David Zeuthen <16a4bae6a7afea1fdd75baca6404fe68f285db96@redhat.com>

ieei/glib,darren-clark/android_platform_external_bluetooth_glib,gale320/glib,tamaskenez/glib,Distrotech/glib,Distrotech/glib,endlessm/glib,01org/android-bluez-glib,antono/glib,cosimoc/glib,johne53/MB3Glib,pstglia/platform-external-bluetooth-glib,cention-sany/glib,lukasz-skalski/glib,01org/android-bluez-glib,tchakabam/glib,cosimoc/glib,mzabaluev/glib,pstglia/external-bluetooth-glib,justinkb/aosp-bluez.glib,ieei/glib,Distrotech/glib,endlessm/glib,johne53/MB3Glib,gale320/glib,01org/android-bluez-glib,MathieuDuponchelle/glib,tchakabam/glib,djdeath/glib,ieei/glib,justinkb/aosp-bluez.glib,cention-sany/glib,iConsole/Console-OS_external_bluetooth_glib,djdeath/glib,johne53/MB3Glib,01org/android-bluez-glib,justinkb/aosp-bluez.glib,antono/glib,MathieuDuponchelle/glib,Distrotech/glib,darren-clark/android_platform_external_bluetooth_glib,cosimoc/glib,tchakabam/glib,lukasz-skalski/glib,antono/glib,krichter722/glib,cention-sany/glib,bluez-android/glib,mzabaluev/glib,johne53/MB3Glib,gale320/glib,cosimoc/glib,krichter722/glib,ieei/glib,tamaskenez/glib,johne53/MB3Glib,djdeath/glib,djdeath/glib,ieei/glib,MathieuDuponchelle/glib,mzabaluev/glib,pstglia/platform-external-bluetooth-glib,gale320/glib,01org/android-bluez-glib,cention-sany/glib,justinkb/aosp-bluez.glib,gale320/glib,lukasz-skalski/glib,djdeath/glib,endlessm/glib,cosimoc/glib,tchakabam/glib,pstglia/external-bluetooth-glib,pstglia/platform-external-bluetooth-glib,MathieuDuponchelle/glib,pstglia/external-bluetooth-glib,cention-sany/glib,endlessm/glib,bluez-android/glib,pstglia/external-bluetooth-glib,darren-clark/android_platform_external_bluetooth_glib,iConsole/Console-OS_external_bluetooth_glib,tamaskenez/glib,iConsole/Console-OS_external_bluetooth_glib,lukasz-skalski/glib,MathieuDuponchelle/glib,Distrotech/glib,krichter722/glib,darren-clark/android_platform_external_bluetooth_glib,endlessm/glib,iConsole/Console-OS_external_bluetooth_glib,lukasz-skalski/glib,tchakabam/glib,pstglia/platform-external-bluetooth-glib,pstglia/external-bluetooth-glib,mzabaluev/glib,tamaskenez/glib,bluez-android/glib,tamaskenez/glib,krichter722/glib,mzabaluev/glib,krichter722/glib,bluez-android/glib,darren-clark/android_platform_external_bluetooth_glib,bluez-android/glib,pstglia/platform-external-bluetooth-glib,johne53/MB3Glib,justinkb/aosp-bluez.glib,antono/glib,iConsole/Console-OS_external_bluetooth_glib