Fix Coverity CID12145 - leaking file handle.

build/rmkdepend/main.c

@@ -753,6 +753,8 @@ char *line,
       printf(" "); /* we need this to update the time stamp! */
       fflush(fdout);
    }
+   if (fdin) fclose(fdin);
+   /* don't mess with stdout: if (fdout) fclose(fdout); */
 }
 
 void fatalerr(char *msg, ...)