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Since snprintf() returns the would-be-output size instead of the actual output size, the succeeding calls may go beyond the given buffer limit. Fix it by replacing with scnprintf(). Cc: Larry Finger <Larry.Finger@lwfinger.net> Cc: b43-dev@lists.infradead.org Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>