Fix bugs

era_apply.c

@@ -50,7 +50,7 @@ void apply_blocks(int src, int dst, off64_t start, off64_t length)
 		written = 0;
 		while (written < fact)
 		{
-			fact_write = write(dst, copy_buffer, fact-written);
+			fact_write = write(dst, copy_buffer+written, fact-written);
 			if (fact_write <= 0)
 			{
 				fprintf(stderr, "Write error: %s\n", strerror(errno));

era_copy.c

@@ -35,7 +35,6 @@ void copy_blocks(int src, int dst, off64_t start, off64_t length)
 			fprintf(stderr, "Failed to copy data: %s\n", strerror(errno));
 			exit(1);
 		}
-		cur += fact;
 		copied += fact;
 	}
 }