staging: iio: frequency: add new line after declarations

This fixes the checkpatch.pl warning:
WARNING: Missing a blank line after declarations
Signed-off-by: NRoxana Blaj <roxanagabriela10@gmail.com>
Acked-by: NDaniel Baluta <daniel.baluta@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/iio/frequency/ad9834.c

@@ -28,6 +28,7 @@
 static unsigned int ad9834_calc_freqreg(unsigned long mclk, unsigned long fout)
 {
 	unsigned long long freqreg = (u64) fout * (u64) (1 << AD9834_FREQ_BITS);
+
 	do_div(freqreg, mclk);
 	return freqreg;
 }