ext/alsa/gstalsa.c: handle min <= max correctly

ext/alsa/gstalsa.c: handle min <= max correctly

Original commit message from CVS:
* ext/alsa/gstalsa.c: (add_channels):
handle min <= max correctly
* ext/alsa/gstalsa.c: (gst_alsa_fixate_to_mimetype),
(gst_alsa_fixate_field_nearest_int), (gst_alsa_fixate):
add fixation functions so we fixate correctly. No preferring of alaw
anymore because it's the first structure.
* ext/alsa/gstalsa.h:
* ext/alsa/gstalsa.c: (gst_alsa_sw_params_dump),
(gst_alsa_hw_params_dump):
add functions to ease debugging in alsalib
* ext/alsa/gstalsa.c: (gst_alsa_probe_hw_params),
(gst_alsa_set_hw_params), (gst_alsa_set_sw_params),
(gst_alsa_start_audio):
only specify hw params if we really setup a format (fixes #134007 -
or at least works around it)