gkeyfile: Only test file descriptors against -1
gkeyfile: Only test file descriptors against -1

Windows CE at least will return other (valid) negative values.

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