10128 csplit should use strlcpy

*** 25,34 ****
--- 25,38 ----
  
  /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  /*        All Rights Reserved   */
  
  /*
+  * Copyright (c) 2018, Joyent, Inc.
+  */
+ 
+ /*
   * csplit - Context or line file splitter
   * Compile: cc -O -s -o csplit csplit.c
   */
  
  #include <stdio.h>
*** 389,399 ****
                          }
                          *delim = savedelim;
                  }
  
                  if ((opfil = fopen(file, "w")) == NULL) {
!                         (void) strcpy(tfile, file);
                          (void) sprintf(fptr, "%.*d", fiwidth, (ctr-2));
                          fatal("Cannot create %s\n", tfile);
                  }
                  return (opfil);
          }
--- 393,403 ----
                          }
                          *delim = savedelim;
                  }
  
                  if ((opfil = fopen(file, "w")) == NULL) {
!                         (void) strlcpy(tfile, file, sizeof (tfile));
                          (void) sprintf(fptr, "%.*d", fiwidth, (ctr-2));
                          fatal("Cannot create %s\n", tfile);
                  }
                  return (opfil);
          }