Simplify variant builder
Simplify variant builder

Build the full return value with one builder, and don't unref the
unowned return value!

Bug #620954.

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