same array size for in- and output in inverse fft function from fftw3

src/maths/cmaths/cmath4.c

@@ -933,7 +933,7 @@ cx_ifft(void *data, short int type, int length, int *newlength, short int *newty
     printf("IFFT: Frequency span: %g Hz, input length: %d\n", 1/span*length, length);
     printf("IFFT: Time resolution: %g s, output length: %d\n", span/(tpts-1), tpts);
 
-    in = fftw_malloc(sizeof(fftw_complex) * (unsigned int) length);
+    in = fftw_malloc(sizeof(fftw_complex) * (unsigned int) tpts);
     out = fftw_malloc(sizeof(fftw_complex) * (unsigned int) tpts);
 
     for (i = 0; i < length; i++) {