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/tests/alsa-mixer-path-test.c

@@ -53,7 +53,6 @@ static pa_strlist *load_makefile() {
     return result;
 }
 
-
 START_TEST (mixer_path_test) {
     DIR *dir;
     struct dirent *ent;

src/tests/mix-special-test.c

@@ -194,7 +194,6 @@ static void pa_mix_generic_s16ne(pa_mix_info streams[], unsigned nstreams, unsig
     }
 }
 
-
 #define SAMPLES 1028
 #define TIMES 1000
 #define TIMES2 100

src/tests/mix-test.c

@@ -35,7 +35,6 @@
 #include <pulsecore/sample-util.h>
 #include <pulsecore/mix.h>
 
-
 /* PA_SAMPLE_U8 */
 static const uint8_t u8_result[3][10] = {
 { 0x00, 0xff, 0x7f, 0x80, 0x9f, 0x3f, 0x01, 0xf0, 0x20, 0x21 },

src/tests/remix-test.c

@@ -76,7 +76,6 @@ int main(int argc, char *argv[]) {
             pa_resampler_free(r);
         }
 
-
     pa_mempool_free(pool);
 
     return 0;