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src/mathutils.c: simplify aubio_is_power_of_two, thanks to Arturo Castro

--- a/src/mathutils.c

+++ b/src/mathutils.c

@@ -441,12 +441,9 @@

 uint_t

 aubio_next_power_of_two (uint_t a)

 {

-  uint_t i;

-  a--;

-  for (i = 0; i < sizeof (uint_t) * CHAR_BIT; i++) {

-    a = a | a >> 1;

-  }

-  return a + 1;

+  uint_t i = 1;

+  while (i < a) i <<= 1;

+  return i;

 }

 smpl_t