failf: remove newline from formatting strings

... as failf adds one itself.

Also: add an assert() to failf() that triggers on a newline in the
format string!

Closes #6365

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/tftp.c b/lib/tftp.c
index fba3f5e8c..ba7c38b25 100644
--- a/lib/tftp.c
+++ b/lib/tftp.c
@@ -493,7 +493,7 @@ static CURLcode tftp_send_first(struct tftp_state_data *state,
       return result;
 
     if(strlen(filename) > (state->blksize - strlen(mode) - 4)) {
-      failf(data, "TFTP file name too long\n");
+      failf(data, "TFTP file name too long");
       free(filename);
       return CURLE_TFTP_ILLEGAL; /* too long file name field */
     }