tty: n_smux: Increased smux log buffer size
tty: n_smux: Increased smux log buffer size

Increase log buffer size to handle the maximum possible log line size.
This prevents passing in a negative buffer size to sprintf() which is
handled gracefully, but generates a warning message in the kernel log.

Change-Id: Ie87fe3a5431757217f4b87338d5af08bc24d84e6
Signed-off-by: Eric Holmberg <5000aa55685d659e1f7f26ece526f9c7021ab484@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas