nft: ruleparse: Add missing braces around ternary

The expression evaluated the sum before the ternay, consequently not
adding target->size if tgsize was zero.

Identified by ASAN for a simple rule using standard target:
| # ebtables -A INPUT -s de:ad:be:ef:0:00 -j RETURN
| # ebtables -D INPUT -s de:ad:be:ef:0:00 -j RETURN
| =================================================================
| ==18925==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x603000000120 at pc 0x7f627a4c75c5 bp 0x7ffe882b5180 sp 0x7ffe882b4928
| READ of size 8 at 0x603000000120 thread T0
| [...]

Fixes: 2a6eee89083c8 ("nft-ruleparse: Introduce nft_create_target()")
Signed-off-by: Phil Sutter <phil@nwl.cc>

0 files changed, 0 insertions, 0 deletions