update-kernel: Sanitize some variables

Signed-off-by: Vitaly Chikunov <vt@altlinux.org>

update-kernel

@@ -90,6 +90,17 @@ ufver() {
 	echo "$v"
 }
 
+all=
+dryrun=
+force=
+headers=
+interactive=
+kernel_flavour=
+list=
+reinstall=
+release=
+verbose=
+
 #parse command line options
 TEMP=$(getopt -n "$PROG" -o a,i,l,f,y,t:,r:,v,n,h -l interactive,list,all,force,type:,release:,verbose,reinstall,dry-run,headers,help -- "$@") || show_help
 eval set -- "$TEMP"
@@ -277,7 +288,7 @@ if [[ "$release" =~ ^[0-9]+\.[0-9.]+-.*-[^-]+$ ]]; then
 	fi
 	kernel_flavour="$flv"
 	release="$ver-$rel"
-	ver='' flv='' rel=''
+	unset ver flv rel
 elif [[ "$release" =~ ^(kernel-image-)?.*[-=#][0-9:]+\.[0-9.]+-[^-]+$ ]]; then
 	# Rewrite release in RPM, APT package format
 	ver="${release#kernel-image-}"
@@ -288,7 +299,7 @@ elif [[ "$release" =~ ^(kernel-image-)?.*[-=#][0-9:]+\.[0-9.]+-[^-]+$ ]]; then
 	fi
 	kernel_flavour="$flv"
 	release="$rel"
-	ver='' flv='' rel=''
+	unset ver flv rel
 fi
 
 # set kernel flavour. if not defined with -t option, use current