fbdev: Fix logic error in "offb" name match

A regression was reported to me recently whereby /dev/fb0 had disappeared
from a PowerBook G3 Series "Wallstreet". The problem shows up when the
"video=ofonly" parameter is passed to the kernel, which is what the
bootloader does when "no video driver" is selected. The cause of the
problem is the "offb" string comparison, which got mangled when it got
refactored. Fix it.

Cc: [email protected]
Fixes: 93604a5 ("fbdev: Handle video= parameter in video/cmdline.c")
Reported-and-tested-by: Stan Johnson <[email protected]>
Signed-off-by: Finn Thain <[email protected]>
Signed-off-by: Helge Deller <[email protected]>

Author: fthain

drivers/video/fbdev/core/fb_cmdline.c

@@ -40,7 +40,7 @@ int fb_get_options(const char *name, char **option)
 	bool enabled;
 
 	if (name)
-		is_of = strncmp(name, "offb", 4);
+		is_of = !strncmp(name, "offb", 4);
 
 	enabled = __video_get_options(name, &options, is_of);