qga: Drop dangling reference to QERR_QGA_LOGGING_DISABLED

slog()'s function comment advises to use QERR_QGA_LOGGING_DISABLED.
This macro never existed.  The reference got added in commit
e3d4d25 "guest agent: add guest agent RPCs/commands" along with
QERR_QGA_LOGGING_FAILED, so maybe that one was meant.  However,
QERR_QGA_LOGGING_FAILED was never actually used, and was removed in
commit d73f0be "qerror.h: Remove unused error classes".

Drop the dangling reference.

Signed-off-by: Markus Armbruster <[email protected]>
Message-Id: <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Juan Quintela <[email protected]>
Reviewed-by: Konstantin Kostiuk <[email protected]>

qga/commands.c

@@ -32,9 +32,8 @@
 #define GUEST_FILE_READ_COUNT_MAX (48 * MiB)
 
 /* Note: in some situations, like with the fsfreeze, logging may be
- * temporarilly disabled. if it is necessary that a command be able
- * to log for accounting purposes, check ga_logging_enabled() beforehand,
- * and use the QERR_QGA_LOGGING_DISABLED to generate an error
+ * temporarily disabled. if it is necessary that a command be able
+ * to log for accounting purposes, check ga_logging_enabled() beforehand.
  */
 void slog(const gchar *fmt, ...)
 {