Index: lib/libc/stdio/fflush.c
===================================================================
--- lib/libc/stdio/fflush.c.orig
+++ lib/libc/stdio/fflush.c
@@ -124,11 +124,13 @@
 		t = _swrite(fp, (char *)p, n);
 		if (t <= 0) {
 			/* Reset _p and _w. */
-			if (p > fp->_p)	/* Some was written. */
+			if (p > fp->_p) {
+				/* Some was written. */
 				memmove(fp->_p, p, n);
-			fp->_p += n;
-			if ((fp->_flags & (__SLBF | __SNBF)) == 0)
-				fp->_w -= n;
+				fp->_p += n;
+				if ((fp->_flags & (__SLBF | __SNBF)) == 0)
+					fp->_w -= n;
+			}
 			fp->_flags |= __SERR;
 			return (EOF);
 		}