[avr-libc-dev] vfprintf warnings

[E. Weddington]

Since I've been giving it a shot at building avrlibc with the latest 
snapshots, I've noticed that there are 4 warnings for vfprintf.c 
stating that 4 variables are possibly uninitialized before use: base, 
pb, width, and prec.

Normally this kind of warning is not ok. But I just wanted to make 
sure that's it's been caught and dealt with.

Eric