Add debugging output if buffer allocation fails for scrypt and round up bufsize to a multiple of 256.

ocl.c

@@ -761,11 +761,22 @@ built:
 	if (opt_scrypt) {
 		size_t ipt = (1024 / gpus[gpu].lookup_gap + (1024 % gpus[gpu].lookup_gap > 0));
 		size_t bufsize = 128 * ipt * gpus[gpu].thread_concurrency;
-		applog(LOG_DEBUG, "Creating scrypt buffer sized %d", bufsize);
 
-		clState->CLbuffer0 = clCreateBuffer(clState->context, CL_MEM_READ_ONLY, 80, NULL, &status);
-		clState->padbuffer8 = clCreateBuffer(clState->context, CL_MEM_READ_WRITE, bufsize, NULL, &status);
+		if (bufsize % 256)
+			bufsize += (256 - bufsize % 256);
+		applog(LOG_DEBUG, "Creating scrypt buffer sized %d", bufsize);
 		clState->padbufsize = bufsize;
+		clState->padbuffer8 = clCreateBuffer(clState->context, CL_MEM_READ_WRITE, bufsize, NULL, &status);
+		if (status != CL_SUCCESS) {
+			applog(LOG_ERR, "Error %d: clCreateBuffer (padbuffer8), decrease CT or increase LG", status);
+			return NULL;
+		}
+
+		clState->CLbuffer0 = clCreateBuffer(clState->context, CL_MEM_READ_ONLY, 128, NULL, &status);
+		if (status != CL_SUCCESS) {
+			applog(LOG_ERR, "Error %d: clCreateBuffer (CLbuffer0)", status);
+			return NULL;
+		}
 	}
 #endif
 	clState->outputBuffer = clCreateBuffer(clState->context, CL_MEM_WRITE_ONLY, BUFFERSIZE, NULL, &status);