various: do not include file names directly in error messages

git grep -l 'Failed to open /'|xargs sed -r -i 's|"Failed to open (/[^ ]+): %m"|"Failed to open %s: %m", "\1"|g'
git grep -l $'Failed to open \'/'|xargs sed -r -i $'s|"Failed to open \'(/[^ ]+)\': %m"|"Failed to open %s: %m", "\\1"|g'
git grep -l "Failed to open /"|xargs sed -r -i $'s|"Failed to open (/[^ ]+), ignoring: %m"|"Failed to open %s, ignoring: %m", "\\1"|g'
+ some manual fixups.

src/rfkill/rfkill.c

@@ -291,7 +291,7 @@ static int run(int argc, char *argv[]) {
                                 return 0;
                         }
 
-                        return log_error_errno(errno, "Failed to open /dev/rfkill: %m");
+                        return log_error_errno(errno, "Failed to open %s: %m", "/dev/rfkill");
                 }
         } else {
                 c.rfkill_fd = SD_LISTEN_FDS_START;