10076 make usr/src/test smatch clean

*** 26,35 ****
--- 26,39 ----
  
  /*
   * 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
*** 82,102 ****
--- 86,109 ----
  
          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);