Remove unused variable in gvdb-reader
Remove unused variable in gvdb-reader

As originally committed against dconf by Owen.

Newer GCC flags this.

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