Fixed issues found by Coverity Scan (#21)

https.c

@@ -290,8 +290,12 @@ _establish_connection(struct https_request * const req,
             if (connected_socket == -1) {
                 continue;
             }
-            sock_flags = fcntl(connected_socket, F_GETFL, 0);
-            fcntl(connected_socket, F_SETFL, sock_flags|O_NONBLOCK);
+            if ((sock_flags = fcntl(connected_socket, F_GETFL, 0)) == -1) {
+                goto fail;
+            }
+            if (fcntl(connected_socket, F_SETFL, sock_flags|O_NONBLOCK) == -1) {
+                goto fail;
+            }
 
             if (connect(connected_socket, cur_res->ai_addr, cur_res->ai_addrlen) != 0 &&
                     errno != EINPROGRESS) {
@@ -301,12 +305,13 @@ _establish_connection(struct https_request * const req,
             }
             socket_error = _fd_wait(connected_socket, 10000);
             if (socket_error != 1) {
-                close(connected_socket);
-                connected_socket = -1;
-                continue;
+                goto fail;
             }
             /* Connected! */
             break;
+        fail:
+            close(connected_socket);
+            connected_socket = -1;
         }
     }
     cur_res = NULL;
@@ -339,8 +344,10 @@ https_init(const char *useragent, const char *cafile, const char *proxy)
         BIO *bio;
         char *p;
 
-        if ((ctx = calloc(1, sizeof(*ctx))) == NULL ||
-            (ctx->useragent = strdup(useragent)) == NULL) {
+        if ((ctx = calloc(1, sizeof(*ctx))) == NULL) {
+                return (HTTPS_ERR_SYSTEM);
+        }
+        if ((ctx->useragent = strdup(useragent)) == NULL) {
                 ctx->errstr = strerror(errno);
                 return (HTTPS_ERR_SYSTEM);
         }