[committed][RISC-V] Fix typo in manually merged patch

[Jeffrey Law]

I backported Robin's fix for pr 126550 to the gcc-15/gcc-14 branches 
manually and goof'd it slightly.  This fixes that goof.  I've verified 
the branch builds again and the test for pr126550 passes on both branches.

Jeffcommit e26d50c48017978e2fcdf9c9ce847ca053094c77
Author: Jeff Law <jeffrey....@oss.qualcomm.com>
Date:   Tue Aug 11 07:15:58 2026 -0600
    [RISC-V] Fix typo in manually merged patch
    
            PR target/126550
    gcc/
            * config/riscv/riscv-v.cc (expand_const_vector): Fix typo in 
manually
            merged patch.

diff --git a/gcc/config/riscv/riscv-v.cc b/gcc/config/riscv/riscv-v.cc
index 2ce6bdeb87e..085986e91ae 100644
--- a/gcc/config/riscv/riscv-v.cc
+++ b/gcc/config/riscv/riscv-v.cc
@@ -1458,7 +1458,7 @@ expand_const_vector (rtx target, rtx src)
                  rtx tmp2 = gen_reg_rtx (builder.mode ());
                  rtx step
                    = simplify_binary_operation (MINUS, builder.inner_mode (),
-                                                builder->elt 
(builder->npatterns ()),
+                                                builder.elt (builder.npatterns 
()),
                                                 builder.elt (0));
                  expand_vec_series (tmp2, const0_rtx, step, tmp1);