Update ICU to 58.1

source/io/sscanf.c

Index: source/io/sscanf.c
diff --git a/source/io/sscanf.c b/source/io/sscanf.c
index ffc850c84f4a762c3219124eebe3e13885ae54e5..31ad8965fc2faeea762827b5f14df054a4e03378 100644
--- a/source/io/sscanf.c
+++ b/source/io/sscanf.c
@@ -1,3 +1,5 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
 /*
 ******************************************************************************
 *
@@ -71,7 +73,7 @@ u_vsscanf(const UChar   *buffer,
     int32_t size = (int32_t)uprv_strlen(patternSpecification) + 1;
 
     /* convert from the default codepage to Unicode */
-    if (size >= MAX_UCHAR_BUFFER_SIZE(patBuffer)) {
+    if (size >= (int32_t)MAX_UCHAR_BUFFER_SIZE(patBuffer)) {
         pattern = (UChar *)uprv_malloc(size * sizeof(UChar));
         if(pattern == 0) {
             return 0;