updated sanity check code

Author: huwenboshi

src/step1.py

@@ -116,7 +116,7 @@ def output_eig_prjsq(chrom, refpanel_snp_idx, refpanel_leg, snp_beta,
             load_line_idx, refpanel_leg, line_idx)
 
         # check if reference genotypes are loaded correctly
-        if(len(locus_beta1) != gens.shape[0]):
+        if(len(locus_beta) != gens.shape[0]):
             sys.stderr.write("An error occurred while loading"
                              " reference panel. Aborting.\n")
             sys.exit(1)