Make error messages even better!

Change-Id: I72bd1eb1d526dc59833e5bc3c636171f7f9545af
diff --git a/libc/arch-arm/krait/bionic/memcpy.S b/libc/arch-arm/krait/bionic/memcpy.S
index f7277fc..d3278d2 100644
--- a/libc/arch-arm/krait/bionic/memcpy.S
+++ b/libc/arch-arm/krait/bionic/memcpy.S
@@ -89,4 +89,4 @@
 
         .data
 error_string:
-        .string     "memcpy buffer overflow"
+        .string     "memcpy prevented write past end of buffer"