Fix bug in Fax decoder.

Thanks to Zeniko for this; one line fix in the fax decoder, to
cope with a case at the start of lines.

This fixes:

 x - 1d faxd overflow.pdf

and

 x - 1d faxd negative code.pdf

1 files changed, 1 insertions, 1 deletions

diff --git a/fitz/filt_faxd.c b/fitz/filt_faxd.c
index 927bf4c4..7ccebddb 100644
--- a/fitz/filt_faxd.c
+++ b/fitz/filt_faxd.c
@@ -211,7 +211,7 @@ find_changing_color(const unsigned char *line, int x, int w, int color)
 	if (!line)
 		return w;
 
-	x = find_changing(line, x, w);
+	x = find_changing(line, (x > 0 || !color) ? x : -1, w);
 
 	if (x < w && getbit(line, x) != color)
 		x = find_changing(line, x, w);