6lowpan: remove excessive argument in pr_debug
6lowpan: remove excessive argument in pr_debug

Remove excessive __func__ argument in pr_debug function and some
excessive debug messages.

Signed-off-by: Alexander Smirnov <143b7e387ad206693c5077db85b8df32630879d1@gmail.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs