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/modules/echo-cancel/module-echo-cancel.c

@@ -462,7 +462,6 @@ static int sink_process_msg_cb(pa_msgobject *o, int code, void *data, int64_t of
     return pa_sink_process_msg(o, code, data, offset, chunk);
 }
 
-
 /* Called from main context */
 static int source_set_state_cb(pa_source *s, pa_source_state_t state) {
     struct userdata *u;
@@ -1301,7 +1300,6 @@ static void sink_input_attach_cb(pa_sink_input *i) {
     pa_sink_attach_within_thread(u->sink);
 }
 
-
 /* Called from source I/O thread context. */
 static void source_output_detach_cb(pa_source_output *o) {
     struct userdata *u;

src/modules/echo-cancel/speex.c

@@ -146,7 +146,6 @@ fail:
     return FALSE;
 }
 
-
 pa_bool_t pa_speex_ec_init(pa_core *c, pa_echo_canceller *ec,
                            pa_sample_spec *rec_ss, pa_channel_map *rec_map,
                            pa_sample_spec *play_ss, pa_channel_map *play_map,

src/modules/echo-cancel/webrtc.cc

@@ -91,7 +91,6 @@ pa_bool_t pa_webrtc_ec_init(pa_core *c, pa_echo_canceller *ec,
         goto fail;
     }
 
-
     hpf = DEFAULT_HIGH_PASS_FILTER;
     if (pa_modargs_get_value_boolean(ma, "high_pass_filter", &hpf) < 0) {
         pa_log("Failed to parse high_pass_filter value");