riscv: Fix warning in riscv_regno_ok_for_index_p

The variable `regno` is currently not used in riscv_regno_ok_for_index_p(),
which triggers a compiler warning. Let's address this.

Fixes: 423604278ed5 ("riscv: Prepare backend for index registers")

Reported-by: Juzhe Zhong <juzhe.zhong@rivai.ai>
Reported-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

gcc/ChangeLog:

	* config/riscv/riscv.cc (riscv_regno_ok_for_index_p):
	Remove parameter name from declaration of unused parameter.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

1 files changed, 1 insertions, 1 deletions

diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index 6ed735d..ae3c034 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -861,7 +861,7 @@ riscv_index_reg_class ()
    but extensions might support that.  */
 
 int
-riscv_regno_ok_for_index_p (int regno)
+riscv_regno_ok_for_index_p (int)
 {
   return 0;
 }