Modify append_data to die on 0 arguments and check arg 2 with isTrue(). Based on a patch from robbat2

ChangeLog

@@ -2,6 +2,10 @@
 # Copyright 1999-2009 Gentoo Foundation; 2008-2009 Various authors (see AUTHORS)
 # Distributed under the GPL v2
 
+  06 Mar 2009; Andrew Gaffney <agaffney@gentoo.org> gen_initramfs.sh:
+  Modify append_data to die on 0 arguments and check arg 2 with isTrue().
+  Based on a patch from robbat2
+
   20 Feb 2009; Andrew Gaffney <agaffney@gentoo.org> arch/sparc64/config.sh,
   gen_compile.sh, gen_funcs.sh, gen_package.sh:
   Add support for multiple possible kernel binary paths for gentoo bug

gen_initramfs.sh

@@ -561,7 +561,8 @@ append_data() {
 	local name=$1 var=$2
 	local func="append_${name}"
 
-	if [ $# -eq 1 ] || [ ${var} -eq 1 ]
+	[ $# -eq 0 ] && gen_die "append_data() called with zero arguments"
+	if [ $# -eq 1 ] || isTrue ${var}
 	then
 	    print_info 1 "        >> Appending ${name} cpio data..."
 	    ${func}