[binutils-gdb] Trivially simplify rust_language::print_enum

[Tom Tromey]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=8ac460b742bc7f49acbcd78f8822386f56814055

commit 8ac460b742bc7f49acbcd78f8822386f56814055
Author: Tom Tromey <tom@tromey.com>
Date:   Thu Feb 9 12:13:08 2023 -0700

    Trivially simplify rust_language::print_enum
    
    rust_language::print_enum computes:
    
      int nfields = variant_type->num_fields ();
    
    ... but then does not reuse this in one spot.  This patch corrects the
    oversight.

Diff:
---
 gdb/rust-lang.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/rust-lang.c b/gdb/rust-lang.c
index 6653f7a9c64..f2017f95211 100644
--- a/gdb/rust-lang.c
+++ b/gdb/rust-lang.c
@@ -495,7 +495,7 @@ rust_language::print_enum (struct value *val, struct ui_file *stream,
     }
 
   bool first_field = true;
-  for (int j = 0; j < variant_type->num_fields (); j++)
+  for (int j = 0; j < nfields; j++)
     {
       if (!first_field)
 	gdb_puts (", ", stream);