Fix code buffer reallocation check for OP_SWITCH on arm.

mono/mini/mini-arm.c

@@ -3792,7 +3792,7 @@ mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
 			 */
 			mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_SWITCH, ins->inst_p0);
 			max_len += 4 * GPOINTER_TO_INT (ins->klass);
-			if (offset > (cfg->code_size - max_len - 16)) {
+			if (offset + max_len > (cfg->code_size - 16)) {
 				cfg->code_size += max_len;
 				cfg->code_size *= 2;
 				cfg->native_code = g_realloc (cfg->native_code, cfg->code_size);