target/arm926ejs: fix memory leaks

The memory leaks detected and fixed are:
- arm register cache;
- EmbeddedICE register cache;
- arm_jtag_reset_callback internal data;
- struct arm926ejs_common.

Issue identified with valgrind.
Tested on SPEAr320 based on arm926ejs.

Change-Id: If2bed02c516051ce4d0eb29b204a3f3337fe5d6a
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5698
Tested-by: jenkins

src/target/embeddedice.c

@@ -303,6 +303,22 @@ struct reg_cache *embeddedice_build_reg_cache(struct target *target,
 	return reg_cache;
 }
 
+/**
+ * Free all memory allocated for EmbeddedICE register cache
+ */
+void embeddedice_free_reg_cache(struct reg_cache *reg_cache)
+{
+	if (!reg_cache)
+		return;
+
+	for (unsigned int i = 0; i < reg_cache->num_regs; i++)
+		free(reg_cache->reg_list[i].value);
+
+	free(reg_cache->reg_list[0].arch_info);
+	free(reg_cache->reg_list);
+	free(reg_cache);
+}
+
 /**
  * Initialize EmbeddedICE module, if needed.
  */