10076 make usr/src/test smatch clean

@@ -26,10 +26,14 @@
 
 /*
  * Copyright (c) 2012 by Delphix. All rights reserved.
  */
 
+/*
+ * Copyright (c) 2018, Joyent, Inc.
+ */
+
 #include "../file_common.h"
 
 /*
  * Create a file with assigned size and then free the specified
  * section of the file

@@ -82,21 +86,24 @@
 
         buf = (char *)malloc(filesize);
 
         if ((fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, mode)) < 0) {
                 perror("open");
+                free(buf);
                 return (1);
         }
         if (write(fd, buf, filesize) < filesize) {
                 perror("write");
+                free(buf);
                 return (1);
         }
         fl.l_whence = SEEK_SET;
         fl.l_start = start_off;
         fl.l_len = off_len;
         if (fcntl(fd, F_FREESP, &fl) != 0) {
                 perror("fcntl");
+                free(buf);
                 return (1);
         }
 
         free(buf);
         return (0);