lbutils/file: rename rw_file_exact

call it rw_exact, so that it's closer to
the name rw. it matches naming more closely;
the alternative was to call rw rw_file

but read/write can handle more than just files!

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/libreboot-utils/lib/command.c

@@ -492,7 +492,7 @@ cat_buf(unsigned char *b)
 	if (b == NULL)
 		exitf("null pointer in cat command");
 
-	if (rw_file_exact(STDOUT_FILENO, b,
+	if (rw_exact(STDOUT_FILENO, b,
 	    GBE_PART_SIZE, 0, IO_WRITE) < 0)
 		exitf("stdout: cat");
 }