[gcc r16-840] diagnostics: use -Wformat-diag more consistently

[Jason Merrill]

https://gcc.gnu.org/g:32396d87b7d92aa2a89f3b2c09f4f1fe373f3ef0

commit r16-840-g32396d87b7d92aa2a89f3b2c09f4f1fe373f3ef0
Author: Jason Merrill <jason@redhat.com>
Date:   Thu May 22 10:10:04 2025 -0400

    diagnostics: use -Wformat-diag more consistently
    
    r10-1211 added various -Wformat-diag warnings about quoting in GCC
    diagnostic strings, but didn't change these two quoting warnings to use that
    flag as well.
    
    gcc/c-family/ChangeLog:
    
            * c-format.cc (flag_chars_t::validate): Control quoting warnings
            with -Wformat-diag.

Diff:
---
 gcc/c-family/c-format.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/c-family/c-format.cc b/gcc/c-family/c-format.cc
index 211d20dd25bf..a44249a02227 100644
--- a/gcc/c-family/c-format.cc
+++ b/gcc/c-family/c-format.cc
@@ -2124,7 +2124,7 @@ flag_chars_t::validate (const format_kind_info *fki,
 	{
 	  format_warning_at_char (format_string_loc, format_string_cst,
 				  format_chars - orig_format_chars - 1,
-				  OPT_Wformat_,
+				  OPT_Wformat_diag,
 				  "%s used within a quoted sequence",
 				  _(s->name));
 	}
@@ -2137,7 +2137,7 @@ flag_chars_t::validate (const format_kind_info *fki,
     {
       format_warning_at_char (format_string_loc, format_string_cst,
 			      format_chars - orig_format_chars,
-			      OPT_Wformat_,
+			      OPT_Wformat_diag,
 			      "%qc conversion used unquoted",
 			      format_char);
     }