badwords: prefer 'null-terminated'

Aligning with existing text.

Closes #20979

lib/curlx/base64.c

@@ -149,7 +149,7 @@ CURLcode curlx_base64_decode(const char *src,
     pos += 3 - padding;
   }
 
-  /* Zero terminate */
+  /* Null-terminate */
   *pos = '\0';
 
   /* Return the decoded data */
@@ -213,7 +213,7 @@ static CURLcode base64_encode(const char *table64,
     }
   }
 
-  /* Zero terminate */
+  /* Null-terminate */
   *output = '\0';
 
   /* Return the pointer to the new data (allocated memory) */

lib/http.c

@@ -4187,7 +4187,7 @@ static CURLcode http_rw_hd(struct Curl_easy *data,
   CURLcode result = CURLE_OK;
   struct SingleRequest *k = &data->req;
   int writetype;
-  DEBUGASSERT(!hd[hdlen]); /* null terminated */
+  DEBUGASSERT(!hd[hdlen]); /* null-terminated */
 
   *pconsumed = 0;
   if((0x0a == *hd) || (0x0d == *hd)) {
@@ -4548,7 +4548,7 @@ CURLcode Curl_http_write_resp_hd(struct Curl_easy *data,
   CURLcode result;
   size_t consumed;
   char tmp = 0;
-  DEBUGASSERT(!hd[hdlen]); /* null terminated */
+  DEBUGASSERT(!hd[hdlen]); /* null-terminated */
 
   result = http_rw_hd(data, hd, hdlen, &tmp, 0, &consumed);
   if(!result && is_eos) {

lib/transfer.c

@@ -794,7 +794,7 @@ CURLcode Curl_xfer_write_resp_hd(struct Curl_easy *data,
                                  const char *hd0, size_t hdlen, bool is_eos)
 {
   if(data->conn->scheme->run->write_resp_hd) {
-    DEBUGASSERT(!hd0[hdlen]); /* null terminated */
+    DEBUGASSERT(!hd0[hdlen]); /* null-terminated */
     /* protocol handlers offering this function take full responsibility
      * for writing all received download data to the client. */
     return data->conn->scheme->run->write_resp_hd(data, hd0, hdlen, is_eos);

lib/vtls/mbedtls.c

@@ -517,7 +517,7 @@ static CURLcode mbed_load_cacert(struct Curl_cfilter *cf,
       curlx_free(newblob);
     }
 #else
-    /* DER encoded certs do not need to be null terminated because it is a
+    /* DER encoded certs do not need to be null-terminated because it is a
        binary format. Thus, if we are not compiling with PEM_PARSE we can avoid
        the extra memory copies altogether. */
     ret = mbedtls_x509_crt_parse_der(&backend->cacert, ca_info_blob->data,
@@ -630,7 +630,7 @@ static CURLcode mbed_load_clicert(struct Curl_cfilter *cf,
       curlx_free(newblob);
     }
 #else
-    /* DER encoded certs do not need to be null terminated because it is a
+    /* DER encoded certs do not need to be null-terminated because it is a
        binary format. Thus, if we are not compiling with PEM_PARSE we can avoid
        the extra memory copies altogether. */
     ret = mbedtls_x509_crt_parse_der(&backend->clicert, ssl_cert_blob->data,