datatop: remove unused variables

Removed unused variables in dtop_stat_search in datatop_stat_poll.c
and get_number_of_values in datatop_gen_poll.c because it was not
compiling with newer GCC revisions.

Change-Id: Icd8316b0e9bf5070762a18aa1ab65859b31dba5d

datatop/src/datatop_gen_poll.c

@@ -69,6 +69,10 @@ static int get_number_of_values(struct dtop_data_point_gatherer *dpg)
 	read = dt_read_file(dpg->file, &data, DTOP_GEN_SIZE);
 	line_len = dt_read_line(line, DTOP_GEN_LINE, data, DTOP_GEN_SIZE, 0);
 
+	if (read == 0) {
+		return 0;
+	}
+
 	if (line_len < 1) {
 		dt_free(&data);
 		return 0;

datatop/src/datatop_stat_poll.c

@@ -219,7 +219,7 @@ static void construct_stat_file_dpg(struct dtop_data_point
  */
 int dtop_stat_search(struct dtop_stat_vars *storage)
 {
-	int i, k, n, sum;
+	int i, n, sum;
 	char *data;
 	int *line_len = malloc(sizeof(int) * storage->line_count);
 	int read;
@@ -297,7 +297,6 @@ int dtop_stat_search(struct dtop_stat_vars *storage)
 			count++;
 		}
 	}
-	k = 0;
 
 	/* Calls dpg constructor, dpg will point to the dp struct */
 	construct_stat_file_dpg(data_points, storage, dp_count);