Fix check for valid boot options

-r will always succeed since the file will be generated regardless
of number of boot entries found. Use -s instead to check for zero
file size.

Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>

initrd/bin/kexec-select-boot

@@ -173,7 +173,7 @@ scan_options() {
 			kexec-parse-bls "$bootdir" "$i" "$bootdir/loader/entries" >> $option_file
 		done
 	fi
-	if [ ! -r $option_file ]; then
+	if [ ! -s $option_file ]; then
 		die "Failed to parse any boot options"
 	fi
 	if [ "$unique" = 'y' ]; then

initrd/bin/oem-factory-reset

@@ -209,7 +209,7 @@ set_default_boot_option()
         kexec-parse-bls "/boot" "$i" "/boot/loader/entries" >> $option_file
       done
     fi
-    [ ! -r $option_file ] \
+    [ ! -s $option_file ] \
         && whiptail_error_die "Failed to parse any boot options"
 
     # sort boot options