Don't treat the error message as a format string in die().

client/tests/disktest/src/disktest.c

 // Copyright Martin J. Bligh & Google. <mbligh@google.com>.
 // New Year's Eve, 2006 
 // Released under the GPL v2.
 //
 // Compile with -D_FILE_OFFSET_BITS=64 -D _GNU_SOURCE
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <sys/types.h>
@@ skipping 25 matching lines @@
 unsigned int seconds = 15;
 unsigned int linear_tasks = 1;
 unsigned int random_tasks = 4;
 unsigned int blocks;
 unsigned int sectors_per_block;
 unsigned int signature = 0;
 unsigned int stop_on_error = 0;
 
 void die(char *error)
 {
-        fprintf(stderr, error);
-        fprintf(stderr, "\n");
+        fprintf(stderr, "%s\n", error);
         exit(1);
 }
 
 /*
  * Fill a block with it's own sector number
  * buf must be at least blocksize
  */
 void write_block(int fd, unsigned int block, struct pattern *buffer)
 {
         unsigned int i, sec_offset, sector;
@@ skipping 312 matching lines @@
 
         for (tasks = 0; tasks < linear_tasks + random_tasks + 4; tasks++) {
                 pid = wait(&retcode);
                 if (retcode != 0) {
                         printf("pid %d exited with status %d\n", pid, retcode);
                         exit(1);
                 }
         }
         return 0;
 }