Bugfix in fft, set Blas vendor to openblas

CMakeLists.txt

@@ -37,6 +37,8 @@ else()
 endif()
 
 if(LASP_USE_BLAS)
+    # link openblas
+    set(BLA_VENDOR OpenBLAS)
     find_package(BLAS REQUIRED)
 endif()
 

lasp/c/lasp_fft.c

@@ -215,7 +215,7 @@ void Fft_fft_single(const Fft* fft,const vd* timedata,vc* result) {
 
     /* For an even fft, the imaginary part of the Nyquist frequency
      * bin equals zero.*/
-    if(likely(nfft%2 == 0)) {
+    if(islikely(nfft%2 == 0)) {
         result_ptr[nfft+1] = 0;
     }
     check_overflow_vx(fft->fft_work);