esapi: don't fake return val from Tss2_Sys_GetDecryptParam()

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
diff --git a/src/tss2-esys/esys_iutil.c b/src/tss2-esys/esys_iutil.c
index 84afd9c..809bf0f 100644
--- a/src/tss2-esys/esys_iutil.c
+++ b/src/tss2-esys/esys_iutil.c
@@ -627,9 +627,7 @@
             const uint8_t *paramBuffer;
             r = Tss2_Sys_GetDecryptParam(esys_context->sys, &paramSize,
                                          &paramBuffer);
-            if (r != TSS2_RC_SUCCESS) {
-                return_error(TSS2_ESYS_RC_NO_DECRYPT_PARAM, "Encryption not possible");
-            }
+            return_if_error(r, "Encryption not possible");
 
             if (paramSize == 0)
                 continue;