target/riscv/kvm: do not use non-portable strerrorname_np()

strerrorname_np is non-portable and breaks building with musl libc.

Use strerror(errno) instead, like we do other places.

Upstream-Status: Submitted [https://mail.gnu.org/archive/html/qemu-stable/2023-12/msg00069.html]

Cc: [email protected]
Fixes: commit 082e9e4 (target/riscv/kvm: improve 'init_multiext_cfg' error
msg)
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2041
Buglink: https://gitlab.alpinelinux.org/alpine/aports/-/issues/15541
Signed-off-by: Natanael Copa <[email protected]>

Author: ncopa

target/riscv/kvm/kvm-cpu.c

@@ -1968,8 +1968,7 @@ static bool kvm_cpu_realize(CPUState *cs, Error **errp)
     if (riscv_has_ext(&cpu->env, RVV)) {
         ret = prctl(PR_RISCV_V_SET_CONTROL, PR_RISCV_V_VSTATE_CTRL_ON);
         if (ret) {
-            error_setg(errp, "Error in prctl PR_RISCV_V_SET_CONTROL, code: %s",
-                       strerrorname_np(errno));
+            error_setg(errp, "Error in prctl PR_RISCV_V_SET_CONTROL, error %d", errno);
             return false;
         }
     }