[committed] testsuite: fix syntax in Wstringop-overflow-59.c

[Sam James]

Fix quoting issues, escaping, and dg directive types.

There were two issues here:
1) The incorrect quoting in an earlier dg-message was covering up that the
syntax in the next part was wrong;
2) Fix dg-warning -> dg-message to correctly pick up the notes. Once 1) was
fixed, this was exposed.

With this, I get:
```
+PASS: gcc.dg/Wstringop-overflow-59.c note (test for warnings, line 192)
+PASS: gcc.dg/Wstringop-overflow-59.c note (test for warnings, line 193)
```

gcc/testsuite/ChangeLog:
        PR middle-end/92936

        * gcc.dg/Wstringop-overflow-59.c: Fix dg-* syntax.
---
Pushed as obvious.

 gcc/testsuite/gcc.dg/Wstringop-overflow-59.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/Wstringop-overflow-59.c 
b/gcc/testsuite/gcc.dg/Wstringop-overflow-59.c
index b6265e37c865..88aac3a3678a 100644
--- a/gcc/testsuite/gcc.dg/Wstringop-overflow-59.c
+++ b/gcc/testsuite/gcc.dg/Wstringop-overflow-59.c
@@ -172,8 +172,8 @@ void memset_malloc_2_same_size (int i)
     if (i < 1)
       i = 1;
 
-    char a4_1[4];             // { dg-message "at offset \\\[1, 4] into 
destination object 'a4_1" "note" }
-    char a4_2[4];             // { dg-message "at offset \\\[1, 4] into 
destination object 'a4_2" "note" }
+    char a4_1[4];             // { dg-message "at offset \\\[1, 4] into 
destination object 'a4_1'" "note" }
+    char a4_2[4];             // { dg-message "at offset \\\[1, 4] into 
destination object 'a4_2'" "note" }
     char *p4 = cond1 ? a4_1 : a4_2;
     char *p4_i = p4 + i;
 
@@ -189,8 +189,8 @@ void memset_malloc_2_off (void)
   int i2 = SR (2, INT_MAX);
 
   {
-    char a5[5];               // { dg-warning "at offset [1, 5] into 
destination object 'a5'
-    char a7[7];               // { dg-warning "at offset [2, 7] into 
destination object 'a7'
+    char a5[5];               // { dg-message "at offset \\\[1, 5] into 
destination object 'a5'" "note" }
+    char a7[7];               // { dg-message "at offset \\\[2, 7] into 
destination object 'a7'" "note" }
     char *p5_p1 = a5 + i1;
     char *p7_p2 = a7 + i2;
     char *p5_7 = cond1 ? p5_p1 : p7_p2;
-- 
2.47.0