Update comments: From wtap_pkthdr to wtap_rec.

Fixup some overlooked comments to reflect refactoring made back
in 2018 with commit 1f5f63f8ef.

wiretap/daintree-sna.c

@@ -141,7 +141,7 @@ daintree_sna_seek_read(wtap *wth, gint64 seek_off, wtap_rec *rec,
 	    err_info);
 }
 
-/* Read a header line, scan it, and fill in a struct wtap_pkthdr.
+/* Read a header line, scan it, and fill in a struct wtap_rec.
  * Then convert packet data from ASCII hex string to binary in place,
  * sanity-check its length against what we assume is the packet length field,
  * and copy it into a Buffer. */

wiretap/ipfix.c

@@ -135,7 +135,7 @@ ipfix_read_message_header(ipfix_message_header_t *pfx_hdr, FILE_T fh, int *err,
 }
 
 
-/* Read IPFIX message header from file and fill in the struct wtap_pkthdr
+/* Read IPFIX message header from file and fill in the struct wtap_rec
  * for the packet, and, if that succeeds, read the packet data.
  * Return true on success.  Set *err to 0 on EOF, any other value for "real"
  * errors (EOF is ok, since return value is still FALSE).

wiretap/netscaler.c

@@ -1727,7 +1727,7 @@ static gboolean nstrace_seek_read_v10(wtap *wth, gint64 seek_off,
     }
 
     /*
-    ** Fill in what part of the struct wtap_pkthdr we can.
+    ** Fill in what part of the struct wtap_rec we can.
     */
 #define GENERATE_CASE_FULL(rec,type,HEADERVER) \
         case NSPR_PDPKTRACEFULLTX_V##type:\

wiretap/pcapng.c

@@ -246,9 +246,9 @@ typedef struct {
  * A handler has a "read" routine and a "write" routine.
  *
  * A "read" routine returns a block as a libwiretap record, filling
- * in the wtap_pkthdr structure with the appropriate record type and
+ * in the wtap_rec structure with the appropriate record type and
  * other information, and filling in the supplied Buffer with
- * data for which there's no place in the wtap_pkthdr structure.
+ * data for which there's no place in the wtap_rec structure.
  *
  * A "write" routine takes a libwiretap record and Buffer and writes
  * out a block.

wiretap/pppdump.c

@@ -308,7 +308,7 @@ pppdump_open(wtap *wth, int *err, gchar **err_info)
 	return WTAP_OPEN_MINE;
 }
 
-/* Set part of the struct wtap_pkthdr. */
+/* Set part of the struct wtap_rec. */
 static void
 pppdump_set_phdr(wtap_rec *rec, int num_bytes,
     direction_enum direction)

wiretap/wtap.h

@@ -1843,7 +1843,7 @@ gboolean wtap_read(wtap *wth, wtap_rec *rec, Buffer *buf, int *err,
  * reading.
  * @seek_off a gint64 giving an offset value returned by a previous
  * wtap_read() call.
- * @phdr a pointer to a struct wtap_pkthdr, filled in with information
+ * @rec a pointer to a struct wtap_rec, filled in with information
  * about the record.
  * @buf a pointer to a Buffer, filled in with data from the record.
  * @param err a positive "errno" value, or a negative number indicating