Fix variable name and comment

Should match the name of the related GUC variable.

Discussion: https://www.postgresql.org/message-id/da4a680a-5d8a-4663-a5c8-a3ccbf23394a@eisentraut.org

src/backend/utils/error/elog.c

@@ -115,8 +115,8 @@ char	   *Log_destination_string = NULL;
 bool		syslog_sequence_numbers = true;
 bool		syslog_split_messages = true;
 
-/* Processed form of backtrace_symbols GUC */
-static char *backtrace_symbol_list;
+/* Processed form of backtrace_functions GUC */
+static char *backtrace_function_list;
 
 #ifdef HAVE_SYSLOG
 
@@ -831,13 +831,13 @@ matches_backtrace_functions(const char *funcname)
 {
 	const char *p;
 
-	if (!backtrace_symbol_list || funcname == NULL || funcname[0] == '\0')
+	if (!backtrace_function_list || funcname == NULL || funcname[0] == '\0')
 		return false;
 
-	p = backtrace_symbol_list;
+	p = backtrace_function_list;
 	for (;;)
 	{
-		if (*p == '\0')			/* end of backtrace_symbol_list */
+		if (*p == '\0')			/* end of backtrace_function_list */
 			break;
 
 		if (strcmp(funcname, p) == 0)
@@ -2180,7 +2180,7 @@ check_backtrace_functions(char **newval, void **extra, GucSource source)
 void
 assign_backtrace_functions(const char *newval, void *extra)
 {
-	backtrace_symbol_list = (char *) extra;
+	backtrace_function_list = (char *) extra;
 }
 
 /*