ioctl_console.2, msgctl.2, msgget.2, msgop.2, semctl.2, semget.2, semop.2, shm_open.3, shmget.2, shmop.2: ERRORS: remove redundant statement that 'errno' is set

This is implied in every other manual page. There is no need to
state it explicitly in these pages.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/ioctl_console.2

@@ -806,8 +806,6 @@ On failure, \-1 is returned, and
 .I errno
 is set to indicate the error.
 .SH ERRORS
-.I errno
-may take on these values:
 .TP
 .B EBADF
 The file descriptor is invalid.

man2/msgctl.2

@@ -335,9 +335,6 @@ On failure, \-1 is returned and
 .I errno
 is set to indicate the error.
 .SH ERRORS
-On failure,
-.I errno
-is set to one of the following:
 .TP
 .B EACCES
 The argument

man2/msgget.2

@@ -151,9 +151,6 @@ On failure, \-1 is returned, and
 .I errno
 is set to indicate the error.
 .SH ERRORS
-On failure,
-.I errno
-is set to one of the following values:
 .TP
 .B EACCES
 A message queue exists for

man2/msgop.2

@@ -348,11 +348,8 @@ On failure, both functions return \-1, and set
 .I errno
 to indicate the error.
 .SH ERRORS
-When
 .BR msgsnd ()
-fails,
-.I errno
-will be set to one among the following values:
+can fail with the following errors:
 .TP
 .B EACCES
 The calling process does not have write permission on the message queue,
@@ -395,11 +392,8 @@ The system does not have enough memory to make a copy of the
 message pointed to by
 .IR msgp .
 .PP
-When
 .BR msgrcv ()
-fails,
-.I errno
-will be set to one among the following values:
+can fail with the following errors:
 .TP
 .B E2BIG
 The message text length is greater than

man2/semctl.2

@@ -449,9 +449,6 @@ returns \-1 and sets
 .I errno
 to indicate the error.
 .SH ERRORS
-On failure,
-.I errno
-will be set to one of the following:
 .TP
 .B EACCES
 The argument

man2/semget.2

@@ -162,9 +162,6 @@ On failure, \-1 is returned, and
 .I errno
 is set to indicate the error.
 .SH ERRORS
-On failure,
-.I errno
-will be set to one of the following:
 .TP
 .B EACCES
 A semaphore set exists for

man2/semop.2

@@ -306,9 +306,6 @@ On failure, they return \-1, and set
 .I errno
 to indicate the error.
 .SH ERRORS
-On failure,
-.I errno
-is set to one of the following:
 .TP
 .B E2BIG
 The argument

man2/shmget.2

@@ -219,9 +219,6 @@ On error, \-1 is returned, and
 .I errno
 is set to indicate the error.
 .SH ERRORS
-On failure,
-.I errno
-is set to one of the following:
 .TP
 .B EACCES
 The user does not have permission to access the

man2/shmop.2

@@ -178,11 +178,8 @@ returns 0; on error \-1 is returned, and
 .I errno
 is set to indicate the error.
 .SH ERRORS
-When
 .BR shmat ()
-fails,
-.I errno
-is set to one of the following:
+can fail with one of the following errors:
 .TP
 .B EACCES
 The calling process does not have the required permissions for
@@ -210,11 +207,9 @@ was NULL.
 .B ENOMEM
 Could not allocate memory for the descriptor or for the page tables.
 .PP
-When
 .BR shmdt ()
-fails,
 .I errno
-is set as follows:
+can fail with one of the following errors:
 .TP
 .B EINVAL
 There is no shared memory segment attached at

man3/shm_open.3

@@ -170,18 +170,13 @@ was specified, in which case a new, distinct object is created).
 On success,
 .BR shm_open ()
 returns a file descriptor (a nonnegative integer).
-On failure,
-.BR shm_open ()
-returns \-1.
+On sucess,
 .BR shm_unlink ()
-returns 0 on success, or \-1 on error.
+returns 0.
+On failure, both functions return \-1 and set
+.I errno
+to indicate the error.
 .SH ERRORS
-On failure,
-.I errno
-is set to indicate the error.
-Values which may appear in
-.I errno
-include the following:
 .TP
 .B EACCES
 Permission to