Various style fixes following review feedback

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2341)

ssl/statem/extensions.c

diff --git a/ssl/statem/extensions.c b/ssl/statem/extensions.c
index 563eb57..8d08b0c 100644
--- a/ssl/statem/extensions.c
+++ b/ssl/statem/extensions.c
@@ -1020,7 +1020,7 @@
             size_t num_curves, clnt_num_curves, i;
             unsigned int group_id;
 
-            /* Check a shared group exists */
+            /* Check if a shared group exists */
 
             /* Get the clients list of supported groups. */
             if (!tls1_get_curvelist(s, 1, &clntcurves, &clnt_num_curves)) {

ssl/statem/extensions_clnt.c

diff --git a/ssl/statem/extensions_clnt.c b/ssl/statem/extensions_clnt.c
index 2516ab9..01a80a0 100644
--- a/ssl/statem/extensions_clnt.c
+++ b/ssl/statem/extensions_clnt.c
@@ -531,8 +531,8 @@
 #ifndef OPENSSL_NO_TLS1_3
 static int add_key_share(SSL *s, WPACKET *pkt, unsigned int curve_id)
 {
-    unsigned char *encodedPoint = NULL;
-    EVP_PKEY *key_share_key = NULL;
+    unsigned char *encoded_point;
+    EVP_PKEY *key_share_key;
     size_t encodedlen;
 
     key_share_key = ssl_generate_pkey_curve(curve_id);
@@ -543,7 +543,7 @@
 
     /* Encode the public key. */
     encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
-                                                &encodedPoint);
+                                                &encoded_point);
     if (encodedlen == 0) {
         SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EC_LIB);
         EVP_PKEY_free(key_share_key);
@@ -552,10 +552,10 @@
 
     /* Create KeyShareEntry */
     if (!WPACKET_put_bytes_u16(pkt, curve_id)
-            || !WPACKET_sub_memcpy_u16(pkt, encodedPoint, encodedlen)) {
+            || !WPACKET_sub_memcpy_u16(pkt, encoded_point, encodedlen)) {
         SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_INTERNAL_ERROR);
         EVP_PKEY_free(key_share_key);
-        OPENSSL_free(encodedPoint);
+        OPENSSL_free(encoded_point);
         return 0;
     }
 
@@ -566,7 +566,7 @@
      */
     s->s3->tmp.pkey = key_share_key;
     s->s3->group_id = curve_id;
-    OPENSSL_free(encodedPoint);
+    OPENSSL_free(encoded_point);
 
     return 1;
 }

ssl/statem/statem_clnt.c

diff --git a/ssl/statem/statem_clnt.c b/ssl/statem/statem_clnt.c
index 5860a23..152600b 100644
--- a/ssl/statem/statem_clnt.c
+++ b/ssl/statem/statem_clnt.c
@@ -1466,7 +1466,7 @@
 static MSG_PROCESS_RETURN tls_process_hello_retry_request(SSL *s, PACKET *pkt)
 {
     unsigned int sversion;
-    int protverr;
+    int errorcode;
     RAW_EXTENSION *extensions = NULL;
     int al;
     PACKET extpkt;
@@ -1480,10 +1480,10 @@
     s->hello_retry_request = 1;
 
     /* This will fail if it doesn't choose TLSv1.3+ */
-    protverr = ssl_choose_client_version(s, sversion);
-    if (protverr != 0) {
+    errorcode = ssl_choose_client_version(s, sversion);
+    if (errorcode != 0) {
         al = SSL_AD_PROTOCOL_VERSION;
-        SSLerr(SSL_F_TLS_PROCESS_HELLO_RETRY_REQUEST, protverr);
+        SSLerr(SSL_F_TLS_PROCESS_HELLO_RETRY_REQUEST, errorcode);
         goto f_err;
     }