getline: Rename &n parameter as &allocsize.

The second parameter passed into getline(3) is the size of the
allocated buffer, *NOT* the length of the returned line.  This can be
confusing, so rename this parameter as 'allocsize' consistently
throughout the code.

This is just code motion.

daemon/lvm-filter.c

@@ -155,8 +155,8 @@ set_filter (const char *filter)
   }
 
   CLEANUP_FREE char *line = NULL;
-  size_t len = 0;
-  while (getline (&line, &len, ifp) != -1) {
+  size_t allocsize = 0;
+  while (getline (&line, &allocsize, ifp) != -1) {
     int r;
     if (is_filter_line (line)) {
       r = fprintf (ofp, "    filter = [ %s ]\n", filter);

daemon/md.c

@@ -442,7 +442,7 @@ do_md_stat (const char *md)
   size_t mdlen;
   FILE *fp;
   CLEANUP_FREE char *line = NULL;
-  size_t len = 0;
+  size_t allocsize = 0;
   ssize_t n;
   guestfs_int_mdstat_list *ret = NULL;
 
@@ -457,7 +457,7 @@ do_md_stat (const char *md)
   }
 
   /* Search for a line which begins with "<md> : ". */
-  while ((n = getline (&line, &len, fp)) != -1) {
+  while ((n = getline (&line, &allocsize, fp)) != -1) {
     if (STRPREFIX (line, md) &&
         line[mdlen] == ' ' && line[mdlen+1] == ':' && line[mdlen+2] == ' ') {
       /* Found it. */

examples/libvirt_auth.c

@@ -104,7 +104,7 @@ auth_callback (guestfs_h *g,
   size_t i;
   char *prompt;
   char *reply = NULL;
-  size_t replylen;
+  size_t allocsize;
   char *pass;
   ssize_t len;
   int r;
@@ -129,7 +129,7 @@ auth_callback (guestfs_h *g,
         printf ("%s: ", prompt);
       free (prompt);
 
-      len = getline (&reply, &replylen, stdin);
+      len = getline (&reply, &allocsize, stdin);
       if (len == -1) {
         perror ("getline");
         exit (EXIT_FAILURE);

fish/fish.c

@@ -972,7 +972,7 @@ execute_and_inline (const char *cmd, int global_exit_on_error)
 {
   FILE *pp;
   CLEANUP_FREE char *line = NULL;
-  size_t len = 0;
+  size_t allocsize = 0;
   ssize_t n;
   int exit_on_error;
   struct parsed_command pcmd;
@@ -983,7 +983,7 @@ execute_and_inline (const char *cmd, int global_exit_on_error)
     return -1;
   }
 
-  while ((n = getline (&line, &len, pp)) != -1) {
+  while ((n = getline (&line, &allocsize, pp)) != -1) {
     exit_on_error = global_exit_on_error;
 
     /* Chomp final line ending which parse_command_line would not expect. */

fish/keys.c

@@ -41,7 +41,7 @@ read_key (const char *param)
   char *ret = NULL;
   int tty;
   int tcset = 0;
-  size_t n = 0;
+  size_t allocsize = 0;
   ssize_t len;
 
   /* Read and write to /dev/tty if available. */
@@ -69,7 +69,7 @@ read_key (const char *param)
     }
   }
 
-  len = getline (&ret, &n, infp);
+  len = getline (&ret, &allocsize, infp);
   if (len == -1) {
     perror ("getline");
     ret = NULL;

tests/mount-local/test-parallel-mount-local.c

@@ -466,13 +466,13 @@ read_line_from (const char *cmd)
 {
   FILE *pp;
   char *ret = NULL;
-  size_t n;
+  size_t allocsize;
 
   pp = popen (cmd, "r");
   if (pp == NULL)
     error (EXIT_FAILURE, errno, "%s: external command failed", cmd);
 
-  if (getline (&ret, &n, pp) == -1)
+  if (getline (&ret, &allocsize, pp) == -1)
     error (EXIT_FAILURE, errno, "could not read line from external command");
 
   if (pclose (pp) == -1)