radeonfb: Fix static array overrun

radeonfb_parse_monitor_layout() will produce an array overrun if passed with a substring of length higher than 4 (ie, "XXXXX,YYYYYY").

Coverity Bug 494

---

 drivers/video/aty/radeon_monitor.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

index 7f9838d..98c05bc 100644
@@ -396,6 +396,10 @@ static int __devinit radeon_parse_monito
 				s1[i] = *s;
 			i++;
 		}
+
+		if (i > 4)
+			i = 4;
+
 	} while (*s++);
 	if (second)
 		s2[i] = 0;

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