more -Wall warning fixes from Cristian Ionescu-Idbohrn.

This time it resulted in small code changes:

function                                             old     new   delta
nexpr                                                820     828      +8
tail_main                                           1200    1202      +2
wrapf                                                166     167      +1
parse_mount_options                                  227     209     -18
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 11/-18)             Total: -7 bytes

1 files changed, 3 insertions, 1 deletions

diff --git a/editors/vi.c b/editors/vi.c
index 4e5a5ac4a..5013d0d51 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -2239,7 +2239,9 @@ static char readit(void)	// read (maybe cursor) key from stdin
                         pfd[0].events = POLLIN;
                         // keep reading while there are input chars, and room in buffer
                         // for a complete ESC sequence (assuming 8 chars is enough)
-                        while (safe_poll(pfd, 1, 0) > 0 && n <= (sizeof(readbuffer) - 8)) {
+                        while ((safe_poll(pfd, 1, 0) > 0)
+                         && ((size_t)n <= (sizeof(readbuffer) - 8))
+                        ) {
                                 // read the rest of the ESC string
                                 int r = safe_read(0, readbuffer + n, sizeof(readbuffer) - n);
                                 if (r > 0)