installer: swap is not mandatory.

installer.sh.in

@@ -252,7 +252,7 @@ ${BOLD}NOTE: you don't need this on EFI systems.${RESET}\n\n
 For EFI systems GPT is mandatory and a FAT32 partition with at least\n
 100MB must be created with the TOGGLE \`boot', this will be used as\n
 EFI System Partition. This partition must have mountpoint as \`/boot/efi'.\n\n
-At least 2 partitions are required: swap and rootfs (/).\n
+At least 1 partitions is required for the rootfs (/).\n
 For swap, RAM*2 must be really enough. For / 600MB are required.\n\n
 ${BOLD}WARNING: /usr is not supported as a separate partition.${RESET}\n
 ${RESET}\n" 18 80
@@ -598,7 +598,7 @@ menu_network() {
 }
 
 validate_filesystems() {
-    local mnts dev size fstype mntpt mkfs rootfound swapfound fmt
+    local mnts dev size fstype mntpt mkfs rootfound fmt
     local usrfound efi_system_partition
 
     unset TARGETFS