KVM: riscv: Fix infinite loop in NACL hfence entry allocation

try_count is initialized to 5 but never decremented in the retry path,
making the `if (try_count)` check always true. If all NACL shared memory
hfence entries remain in the pending state after sync, the function loops
forever, causing a soft lockup. Decrement try_count on each retry so the
fallback warning and return become reachable.

Fixes: d466c19cead5 ("RISC-V: KVM: Add common nested acceleration support")
Signed-off-by: Zongmin Zhou <zhouzongmin@kylinos.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260716073756.44153-1-min_halo@163.com
Signed-off-by: Anup Patel <anup@brainfault.org>

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