ssl->ctx cannot be NULL.

Most code already dereferences it directly.

Change-Id: I227fa91ecbf25a19077f7cfba21b0abd2bc2bd1d
Reviewed-on: https://boringssl-review.googlesource.com/7422
Reviewed-by: David Benjamin <davidben@google.com>
diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index 174e9ae..826b300 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -1259,17 +1259,15 @@
     return ssl->cipher_list->ciphers;
   }
 
-  if (ssl->version >= TLS1_1_VERSION && ssl->ctx != NULL &&
-      ssl->ctx->cipher_list_tls11 != NULL) {
+  if (ssl->version >= TLS1_1_VERSION && ssl->ctx->cipher_list_tls11 != NULL) {
     return ssl->ctx->cipher_list_tls11->ciphers;
   }
 
-  if (ssl->version >= TLS1_VERSION && ssl->ctx != NULL &&
-      ssl->ctx->cipher_list_tls10 != NULL) {
+  if (ssl->version >= TLS1_VERSION && ssl->ctx->cipher_list_tls10 != NULL) {
     return ssl->ctx->cipher_list_tls10->ciphers;
   }
 
-  if (ssl->ctx != NULL && ssl->ctx->cipher_list != NULL) {
+  if (ssl->ctx->cipher_list != NULL) {
     return ssl->ctx->cipher_list->ciphers;
   }
 
@@ -1287,7 +1285,7 @@
     return ssl->cipher_list_by_id;
   }
 
-  if (ssl->ctx != NULL && ssl->ctx->cipher_list_by_id != NULL) {
+  if (ssl->ctx->cipher_list_by_id != NULL) {
     return ssl->ctx->cipher_list_by_id;
   }