Bugfix + tests

src/ttail_search_files.c

 		}
 		last = -1; /* last pos we saw a '\n' */
 		cur = read_beg;
-		while(cur < start)
+		while(cur <= start)
 		{
 			c = getc(f);
 			if(c == EOF)

tests/ttail_search_check.c

 	long res;
 	fseek(fpl, -1, SEEK_END);
 	res = _ttail_file_start_line(fpl);
-	printf("%ld\n", res);
+	ck_assert(res == 357);
+	res = _ttail_file_start_line(fpl);
 	ck_assert(res == 357);
 	fseek(fpl, -1, SEEK_CUR);
 	res = _ttail_file_start_line(fpl);
-	printf("%ld\n", res);
 	ck_assert(res == 298);
+	fseek(fpl, -1, SEEK_CUR);
 	res = _ttail_file_start_line(fpl);
 	ck_assert(res == 221);
+	fseek(fpl, -1, SEEK_CUR);
 	res = _ttail_file_start_line(fpl);
 	ck_assert(res == 136);
+	fseek(fpl, -1, SEEK_CUR);
 	res = _ttail_file_start_line(fpl);
 	ck_assert(res == 77);
+	fseek(fpl, -1, SEEK_CUR);
 	res = _ttail_file_start_line(fpl);
 	ck_assert(res == 0);
 }