Improve error reporting when a file given on the command line

cannot be opened:
* Mention the filename.
* Report the errno for the file itself, not the one with .gz appended.

1 files changed, 1 insertions, 1 deletions

diff --git a/main.c b/main.c
index 400e7e65..1484eb90 100644
--- a/main.c
+++ b/main.c
@@ -561,7 +561,7 @@ main(int argc, char *argv[])
 			}
 		} else
 			mandoc_msg(MANDOCERR_FILE, 0, 0,
-			    "%s", strerror(errno));
+			    "%s: %s", thisarg, strerror(errno));
 
 		if (curp.wstop && mandoc_msg_getrc() != MANDOCLEVEL_OK)
 			break;