fix warnings in openair1/PHY/MODULATION/compute_bf_weights.c

Several various fixes are included. Not sure what component of
the system uses this file.

There is one 'abort' added in case a fscanf fails. It may be a
bit too brutal.

openair1/PHY/MODULATION/compute_bf_weights.c

 #include <stdio.h>
 #include <stdint.h>
+#include <stdlib.h>
 #include "PHY/impl_defs_lte.h"
 
 int f_read(char *calibF_fname, int nb_ant, int nb_freq, int32_t **tdd_calib_coeffs){
 
   FILE *calibF_fd;
-  int i,j,l,calibF_e;
+  int i,j,calibF_e;
   
   calibF_fd = fopen(calibF_fname,"r");
  
@@ -14,7 +15,7 @@ int f_read(char *calibF_fname, int nb_ant, int nb_freq, int32_t **tdd_calib_coef
   
     for(i=0;i<nb_ant;i++){
       for(j=0;j<nb_freq*2;j++){
-  fscanf(calibF_fd, "%d", &calibF_e);
+        if (fscanf(calibF_fd, "%d", &calibF_e) != 1) abort();
         tdd_calib_coeffs[i][j] = (int16_t)calibF_e;
       }
     }
@@ -22,11 +23,15 @@ int f_read(char *calibF_fname, int nb_ant, int nb_freq, int32_t **tdd_calib_coef
     printf("%d\n",(int)tdd_calib_coeffs[1][599]);
   } else
    printf("%s not found, running with defaults\n",calibF_fname);
+  /* TODO: what to return? is this code used at all? */
+  return 0;
 }
 
 
 int estimate_DLCSI_from_ULCSI(int32_t **calib_dl_ch_estimates, int32_t **ul_ch_estimates, int32_t **tdd_calib_coeffs, int nb_ant, int nb_freq) {
 
+  /* TODO: what to return? is this code used at all? */
+  return 0;
 
 }
 
@@ -44,6 +49,8 @@ int compute_BF_weights(int32_t **beam_weights, int32_t **calib_dl_ch_estimates,
   default :
   break;  
 }
+  /* TODO: what to return? is this code used at all? */
+  return 0;
 } 
 
 // temporal test function