Return the result directly for short cut, since We needn't do the
following check on the PMP entries if there is no PMP rules.

Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
 target/riscv/pmp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/riscv/pmp.c b/target/riscv/pmp.c
index 406cff74f2..9cc5c0e9e8 100644
--- a/target/riscv/pmp.c
+++ b/target/riscv/pmp.c
@@ -316,6 +316,7 @@ int pmp_hart_has_privs(CPURISCVState *env, target_ulong addr,
                                        allowed_privs, mode)) {
             ret = MAX_RISCV_PMPS;
         }
+        return ret;
     }
 
     if (size == 0) {
-- 
2.25.1