add_key.2: ffix

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

man2/add_key.2

@@ -16,12 +16,12 @@ add_key \- add a key to the kernel's key management facility
 .nf
 .B #include <sys/types.h>
 .B #include <keyutils.h>
-.sp
+.PP
 .BI "key_serial_t add_key(const char *" type ", const char *" description ,
 .BI "                     const void *" payload ", size_t " plen ,
 .BI "                     key_serial_t " keyring ");"
 .fi
-
+.PP
 No glibc wrapper is provided for this system call; see NOTES.
 .SH DESCRIPTION
 .BR add_key ()
@@ -121,7 +121,7 @@ This key type is essentially the same as
 but it does not permit the key to read.
 This is suitable for storing payloads
 that you do not want to be readable from user space.
-
+.PP
 This key type vets the
 .I description
 to ensure that it is qualified by a "service" prefix,
@@ -226,18 +226,18 @@ The program below creates a key with the type, description, and payload
 specified in its command-line arguments,
 and links that key into the session keyring.
 The following shell session demonstrates the use of the program:
-
+.PP
 .in +4n
-.nf
+.EX
 $ \fB./a.out user mykey "Some payload"\fP
 Key ID is 64a4dca
 $ \fBgrep \(aq64a4dca\(aq /proc/keys\fP
 064a4dca I--Q---    1 perm 3f010000  1000  1000 user    mykey: 12
-.fi
+.EE
 .in
 .SS Program source
 \&
-.nf
+.EX
 #include <sys/types.h>
 #include <keyutils.h>
 #include <stdio.h>
@@ -266,7 +266,7 @@ main(int argc, char *argv[])
 
     exit(EXIT_SUCCESS);
 }
-.fi
+.EE
 .SH SEE ALSO
 .ad l
 .nh
@@ -282,7 +282,7 @@ main(int argc, char *argv[])
 .BR thread\-keyring (7),
 .BR user\-keyring (7),
 .BR user\-session\-keyring (7)
-
+.PP
 The kernel source files
 .IR Documentation/security/keys.txt
 and