com_err: fix function declarations without prototype

Otherwise, clang-18 fails with

    error: a function definition without a prototype is deprecated
    in all versions of C and is not supported in C23
    [-Werror,-Wdeprecated-non-prototype]

com_err/et/com_err.c

@@ -133,11 +133,10 @@ errf com_err_hook = default_com_err_proc;
 
 void
 __attribute__((format(printf, 3, 0)))
-com_err_va (whoami, code, fmt, args)
-    const char *whoami;
-    long code;
-    const char *fmt;
-    va_list args;
+com_err_va (const char *whoami,
+            long code,
+            const char *fmt,
+            va_list args)
 {
     (*com_err_hook) (whoami, code, fmt, args);
 }
@@ -172,8 +171,7 @@ EXPORTED void INTERFACE_C com_err (va_alist)
     va_end(pvar);
 }
 
-errf set_com_err_hook (new_proc)
-    errf new_proc;
+errf set_com_err_hook (errf new_proc)
 {
     errf x = com_err_hook;
 

com_err/et/error_message.c

@@ -62,8 +62,7 @@ static char buffer[25];
 
 extern struct et_list * _et_list;
 
-EXPORTED const char * INTERFACE error_message (code)
-long code;
+EXPORTED const char * INTERFACE error_message (long code)
 {
     int offset;
     long l_offset;

com_err/et/et_name.c

@@ -57,8 +57,7 @@ static const char char_set[] =
 
 static char buf[6];
 
-const char * error_table_name (num)
-    long num;
+const char * error_table_name (long num)
 {
     long ch;
     int i;

com_err/et/init_et.c

@@ -52,10 +52,9 @@
 
 extern struct et_list * _et_list;
 
-int init_error_table(msgs, base, count)
-    const char * const * msgs;
-    int base;
-    int count;
+int init_error_table(const char * const * msgs,
+                     int base,
+                     int count)
 {
     struct et_list *etl;
     struct error_table *et;