msvcp80: Make it possible to shrink allocated memory in basic_string::reserve.

dlls/msvcp80/string.c

@@ -916,8 +916,8 @@ void __thiscall MSVCP_basic_string_char_reserve(basic_string_char *this, MSVCP_s
     if(len > size)
         return;
 
-    basic_string_char_grow(this, size, FALSE);
-    basic_string_char_eos(this, len);
+    if(basic_string_char_grow(this, size, TRUE))
+        basic_string_char_eos(this, len);
 }
 
 /* ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ */
@@ -2767,8 +2767,8 @@ void __thiscall MSVCP_basic_string_wchar_reserve(basic_string_wchar *this, MSVCP
     if(len > size)
         return;
 
-    basic_string_wchar_grow(this, size, FALSE);
-    basic_string_wchar_eos(this, len);
+    if(basic_string_wchar_grow(this, size, TRUE))
+        basic_string_wchar_eos(this, len);
 }
 
 /* ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@XZ */