Whitespace cleanup: Remove all multiple newlines

This patch removes all occurrences of double and triple
newlines.

Command used for this:
find .  -type d \( -name ffmpeg \) -prune -o \
        -regex '\(.*\.[hc]\|.*\.cc\)' \
        -a -not -name 'adrian-aec.*' -a -not \
        -name reserve.c -a -not -name 'rtkit.*' \
        -exec sed -i -e '/^$/{N;s/^\n$//}' {} \;

Two passes were needed to remove triple newlines.
The excluded files are mirrored files from external sources.

src/pulsecore/time-smoother.c

@@ -134,7 +134,6 @@ void pa_smoother_free(pa_smoother* s) {
         x = ((x)+1) % HISTORY_MAX;              \
     } while(FALSE)
 
-
 static void drop_old(pa_smoother *s, pa_usec_t x) {
 
     /* Drop items from history which are too old, but make sure to