No need to use perror() after td_verror()

That'll just result in the error being displayed twice.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/memory.c b/memory.c
index f108e47..384b806 100644
--- a/memory.c
+++ b/memory.c
@@ -70,14 +70,12 @@
 		td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags);
 		if (td->shm_id < 0) {
 			td_verror(td, errno, "shmget");
-			perror("shmget");
 			return 1;
 		}
 
 		td->orig_buffer = shmat(td->shm_id, NULL, 0);
 		if (td->orig_buffer == (void *) -1) {
 			td_verror(td, errno, "shmat");
-			perror("shmat");
 			td->orig_buffer = NULL;
 			return 1;
 		}
@@ -91,8 +89,7 @@
 			td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);
 
 			if (td->mmapfd < 0) {
-				td_verror(td, errno, "open");
-				perror("open mmap file");
+				td_verror(td, errno, "open mmap file");
 				td->orig_buffer = NULL;
 				return 1;
 			}
@@ -102,7 +99,6 @@
 		td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, flags, td->mmapfd, 0);
 		if (td->orig_buffer == MAP_FAILED) {
 			td_verror(td, errno, "mmap");
-			perror("mmap");
 			td->orig_buffer = NULL;
 			if (td->mmapfd) {
 				close(td->mmapfd);