parser_bison: string memleak in YYERROR path

Release dynamically allocated string by lex from the YYERROR path, e.g.

 # cat test.nft
 table x {
        map test {
                type ipv4_addr . foo . inet_service : ipv4_addr . inet_service
        }
 }

 # nft -f test.nft
test.nft:3:20-22: Error: unknown datatype foo
                type ipv4_addr . foo . inet_service : ipv4_addr . inet_service
                                 ^^^
test.nft:6-9: Error: set definition does not specify key
        map test {
            ^^^^
 ==29692==ERROR: LeakSanitizer: detected memory leaks

 Direct leak of 5 byte(s) in 1 object(s) allocated from:
    #0 0x7f6c869e8810 in strdup (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x3a810)
    #1 0x7f6c8637f63a in xstrdup /home/test/nftables/src/utils.c:85
    #2 0x7f6c8648a4d3 in nft_lex /home/test/nftables/src/scanner.l:740

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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