Bug#458246: report xrdb: filename:, not <stdin>

[jidanni@jidanni.org]

reopen 458246
retitle 458246 report xrdb: filename:, not <stdin>
reassign 458246 x11-xserver-utils
thanks

Case 1:
$ xrdb zz
<stdin>:42:20: warning: missing terminating ' character

I clearly gave it a filename, as the xrdb man page instructs, but
instead it reports "<stdin>". This causes _many hours_ of chasing down
the source of errors when used in scripts!

Case 2:
$ xrdb yy
xrdb: colon missing on line 1, ignoring line

Here it says it's own name, at least.

I have an idea: why doesn't it say both!
xrdb: xx: missing blob at line 47, ...

(Must I supply you with the lines that triggered these? OK, though
irrelevant: jjjjj and ! bla'.)