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File vbox_fix_for_gcc7.patch of Package virtualbox

Index: VirtualBox-5.1.22/src/VBox/Devices/PC/ipxe/src/arch/i386/interface/pxe/pxe_preboot.c
===================================================================
--- VirtualBox-5.1.22.orig/src/VBox/Devices/PC/ipxe/src/arch/i386/interface/pxe/pxe_preboot.c
+++ VirtualBox-5.1.22/src/VBox/Devices/PC/ipxe/src/arch/i386/interface/pxe/pxe_preboot.c
@@ -262,6 +262,7 @@ pxenv_restart_tftp ( struct s_PXENV_TFTP
 
 	/* Restart NBP */
 	rmlongjmp ( pxe_restart_nbp, PXENV_RESTART_TFTP );
+	return 0;
 }
 
 /* PXENV_START_UNDI