am 6435d27f: Merge "bionic: fix NULL parameter failure in getcwd()"

* commit '6435d27f9d45d01fbd15bcc3dcd9617b86b825bb':
  bionic: fix NULL parameter failure in getcwd()

libc/unistd/getcwd.c

@@ -26,10 +26,15 @@
  * SUCH DAMAGE.
  */
 #include <unistd.h>
+#include <errno.h>
 
 extern int __getcwd(char * buf, size_t size);
 
 char *getcwd(char *buf, size_t size)
 {
+  if (buf == NULL || size == 0) {
+    errno = EINVAL;
+    return NULL;
+  }
   return ( __getcwd(buf, size) < 0 ) ? NULL : buf;
 }