Fixed #264 the memory leak bug in dtrtri_U.

interface/trtri.c

@@ -138,6 +138,9 @@ int NAME(char *UPLO, char *DIAG, blasint *N, FLOAT *a, blasint *ldA, blasint *In
     // call dtrtri from lapack for a walk around.
     if(uplo==0){
       dtrtri_lapack_(UPLO, DIAG, N, a, ldA, Info);
+#ifndef PPC440
+      blas_memory_free(buffer);
+#endif
       return 0;
     }
 #endif