[PATCH] Fix src/function.c build failure on gcc-12.

[Sergei Trofimovich]

From: Sergei Trofimovich <siarheit@google.com>

Upcoming gcc-12 detects possible buffer overflow for 1 byte:

    src/function.c: In function 'func_call':
    src/function.c:2781:24: error: '__builtin___sprintf_chk' may write a 
terminating nul past the end of the destination [-Werror=format-overflow=8]
     2781 |       sprintf (num, "%d", i);
          |                        ^
    In file included from glibc-2.35-dev/include/stdio.h:894,
                     from src/makeint.h:89,
                     from src/function.c:17:
    In function 'sprintf',
        inlined from 'func_call' at src/function.c:2781:7:
    glibc-2.35-dev/include/bits/stdio2.h:38:10: note: '__builtin___sprintf_chk' 
output between 2 and 12 bytes into a destination of size 11

Unlikely numbers like '-1234567890' including null terminator take 12
bytes of storage.

* src/function.c: Allocate enough storage for num
---
 src/function.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/function.c b/src/function.c
index 9add8f65..af2095da 100644
--- a/src/function.c
+++ b/src/function.c
@@ -2776,7 +2776,7 @@ func_call (char *o, char **argv, const char *funcname 
UNUSED)
 
   for (; i < max_args; ++i)
     {
-      char num[11];
+      char num[12];
 
       sprintf (num, "%d", i);
       define_variable (num, strlen (num), "", o_automatic, 0);
-- 
2.35.1