sensors: json: Skip printing an unnecessary newline

Don't print a newline if no features were printed.

This is based on a patch from the su8 user on GitHub.

Signed-off-by: Ondřej Lysoněk <olysonek@redhat.com>

prog/sensors/chips.c

@@ -112,7 +112,8 @@ void print_chip_json(const sensors_chip_name *name)
 		printf("\n      }");
 		cnt++;
 	}
-	printf("\n");
+	if (cnt > 0)
+		printf("\n");
 }
 
 static const char hyst_str[] = "hyst";