target/riscv: vector_helper: Fixup local variables shadowing

Local variables shadowing other local variables or parameters make the
code needlessly hard to understand.  Bugs love to hide in such code.
Evidence: "[PATCH v3 1/7] migration/rdma: Fix save_page method to fail
on polling error".

This patch removes the local variable shadowing. Tested by adding:

    --extra-cflags='-Wshadow=local -Wno-error=shadow=local -Wno-error=shadow=compatible-local'

To configure

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20230925043023.71448-4-alistair.francis@wdc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

target/riscv/vector_helper.c

@@ -516,7 +516,7 @@ vext_ldff(void *vd, void *v0, target_ulong base,
                 k++;
                 continue;
             }
-            target_ulong addr = base + ((i * nf + k) << log2_esz);
+            addr = base + ((i * nf + k) << log2_esz);
             ldst_elem(env, adjust_addr(env, addr), i + k * max_elems, vd, ra);
             k++;
         }
@@ -4791,9 +4791,10 @@ void HELPER(NAME)(void *vd, void *v0, target_ulong s1, void *vs2,         \
     uint32_t total_elems = vext_get_total_elems(env, desc, esz);          \
     uint32_t vta = vext_vta(desc);                                        \
     uint32_t vma = vext_vma(desc);                                        \
-    target_ulong i_max, i;                                                \
+    target_ulong i_max, i_min, i;                                         \
                                                                           \
-    i_max = MAX(MIN(s1 < vlmax ? vlmax - s1 : 0, vl), env->vstart);       \
+    i_min = MIN(s1 < vlmax ? vlmax - s1 : 0, vl);                         \
+    i_max = MAX(i_min, env->vstart);                                      \
     for (i = env->vstart; i < i_max; ++i) {                               \
         if (!vm && !vext_elem_mask(v0, i)) {                              \
             /* set masked-off elements to 1s */                           \