commit e4ac92df2791 ("serial: samsung: Neaten dbg uses") introduced
a regression in the conversion from vsprintf to vsnprintf.

This fixes the build error by passing the correct variable name.

Signed-off-by: Arnd Bergmann <a...@arndb.de>
Cc: Joe Perches <j...@perches.com>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Doug Anderson <diand...@chromium.org>
Cc: Kukjin Kim <kgene....@samsung.com>

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 3293377..c1d3ebd 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -66,7 +66,7 @@ static void dbg(const char *fmt, ...)
        char buff[256];
 
        va_start(va, fmt);
-       vscnprintf(buff, sizeof(buf), fmt, va);
+       vscnprintf(buff, sizeof(buff), fmt, va);
        va_end(va);
 
        printascii(buff);

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