oscplot: fix memory corruption in plot_setup()

When initializing a FFT plot, plot_setup initializes the transform
as well as the X and Y axis and passes the handles to the gtkdatabox library.
After initialization osc_plot_update_rx_lbl is called which calls transform_setup,
invalidating the handles sent to the gtkdatabox. This causes gtkdatabox to apply
operations on invalid memory areas. To fix this, we make sure we don't reinitialize
the transform on initial setup.

Signed-off-by: Adrian Suciu <[email protected]>

dialogs.c: re-use refresh_serial() when serial intf now available

When serial interface not available it, dialogs will be unavailable.
To cleanup the code, move this in the refresh_serial() function, under the
SERIAL_BACKEND definition.

Signed-off-by: Alexandru Ardelean <[email protected]>

osc: wavefroms: Add some single and multicarrier LTE test waveforms

Signed-off-by: Michael Hennerich <[email protected]>

math channels: Fix handling channels with IDs like: 'voltage0_q'

It was not expected for a channel ID to contain any characters after the trailing digits.
The fix now handles IDs that may have extra word characters after the digits.

Signed-off-by: Dan Nechita <[email protected]>

dialogs.c: Make non-exported functions static

Make functions not used outside of dialogs.c static.

osc: return proper error statuses for profile loading failures

Fixes return statuses when failing out of test profiles.

Fixes analogdevicesinc#54.

plugins/fmcomms2: Workaround in_out_voltage_filter_fir_en with latest…

… libiio

Temporary Workaround

Signed-off-by: Michael Hennerich <[email protected]>

Merge branch 'master' into 2015_R2

Spectrum Analyzer: Fix frequency axis scale label not showing MHz

Signed-off-by: Dan Nechita <[email protected]>

oscplot.c: Fix endless loop when "save_markers" is used

Signed-off-by: Paul Cercueil <[email protected]>