fix up free() old defensive code

db/db.vcproj

@@ -1773,6 +1773,18 @@
 				RelativePath="..\scripting\engine_spidermonkey.cpp"
 				>
 			</File>
+			<File
+				RelativePath="..\shell\mongo_vstudio.cpp"
+				>
+				<FileConfiguration
+					Name="Debug|Win32"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"
+					/>
+				</FileConfiguration>
+			</File>
 		</Filter>
 	</Files>
 	<Globals>

scripting/engine_spidermonkey.cpp

@@ -75,6 +75,8 @@ namespace mongo {
         string toString( JSString * so ){
             jschar * s = JS_GetStringChars( so );
             size_t srclen = JS_GetStringLength( so );
+            if( srclen == 0 )
+                return "";
             
             size_t len = srclen * 2;
             char * dst = (char*)malloc( len );

stdafx.h

@@ -315,8 +315,11 @@ namespace mongo {
 #if defined(_WIN32)
 #define strcasecmp _stricmp
     inline void our_debug_free(void *p) {
+#if 0
+// this is not safe if you malloc < 4 bytes so we don't use anymore
         unsigned *u = (unsigned *) p;
         u[0] = 0xEEEEEEEE;
+#endif
         free(p);
     }
 #define free our_debug_free