libreboot-utils/file: never retry file rw on zero

even with a timer, it's possible that on a buggy system,
we may keep writing even though the outcome is zero. if
a system comes back with zero bytes written, that is a
fatal bug and we should stop.

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

util/libreboot-utils/lib/command.c

@@ -493,7 +493,7 @@ cat_buf(unsigned char *b)
 		exitf("null pointer in cat command");
 
 	if (rw_file_exact(STDOUT_FILENO, b,
-	    GBE_PART_SIZE, 0, IO_WRITE, MAX_ZERO_RW_RETRY) < 0)
+	    GBE_PART_SIZE, 0, IO_WRITE) < 0)
 		exitf("stdout: cat");
 }
 void