fbdev: Fix return code of edid_checksum

edid_checksum always return success (1) although it can fail. Fix.

---

 fbmon.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff -Nru a/drivers/video/fbmon.c b/drivers/video/fbmon.c
@@ -183,7 +183,7 @@
 			err = 0;
 	}
 
-	return 1;
+	return err;
 }
 
 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)

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