fbdev: nvidiafb: Correct const string length in nvidiafb_setup()

The actual length of const string "noaccel" is 7, but the strncmp()
branch in nvidiafb_setup() wrongly hard codes it as 6.

Fix by using actual length 7 as argument of the strncmp().

Signed-off-by: Zijun Hu <[e-mail]>
Signed-off-by: Helge Deller <[e-mail]>

drivers/video/fbdev/nvidia/nvidia.c

···
 			flatpanel = 1;
 		} else if (!strncmp(this_opt, "hwcur", 5)) {
 			hwcur = 1;
-		} else if (!strncmp(this_opt, "noaccel", 6)) {
+		} else if (!strncmp(this_opt, "noaccel", 7)) {
 			noaccel = 1;
 		} else if (!strncmp(this_opt, "noscale", 7)) {
 			noscale = 1;