Convert some errors to warnings rather than failures so the calling program doesn't fail.

[Poikilos]

skipping non-regular file "Documents"
         80,428   0%   68.15MB/s    0:00:00 (xfr#9, ir-chk=1029/1050)
skipping non-regular file "wrong stuff/Send Registration"
     18,446,955   1%  536.72kB/s    0:00:33 (xfr#137, to-chk=158/1329)
rsync: mkstemp "/media/maria/CRUZER64/maria/Desktop/Marilyn/.MKA 2:14:13.cwk.2y1VfK" failed: Invalid argument (22)
     36,808,026   2%    1.01MB/s    0:00:34 (xfr#138, to-chk=0/1329)  

Later it looks like:

skipping non-regular file "Documents"
         80,428   0%   68.15MB/s    0:00:00 (xfr#9, ir-chk=1029/1050)
skipping non-regular file "wrong stuff/Send Registration"
     18,446,955   1%  536.72kB/s    0:00:33 (xfr#137, to-chk=158/1329)
rsync: mkstemp "/media/maria/CRUZER64/maria/Desktop/Marilyn/.MKA 2:14:13.cwk.2y1VfK" failed: Invalid argument (22)
     36,808,026   2%  640.87kB/s    0:00:56 (xfr#138, to-chk=0/1329)  
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1207) [sender=3.1.3]