fixed multiple minor warnings for XCode

programs/bench.c

@@ -58,7 +58,7 @@
 #define MB *(1 <<20)
 #define GB *(1U<<30)
 
-static const size_t maxMemory = (sizeof(size_t)==4)  ?  (2 GB - 64 MB) : (size_t)(1ULL << ((sizeof(size_t)*8)-30));
+static const size_t maxMemory = (sizeof(size_t)==4)  ?  (2 GB - 64 MB) : (size_t)(1ULL << ((sizeof(size_t)*8)-31));
 
 static U32 g_compressibilityDefault = 50;
 

programs/zstdcli.c

@@ -478,8 +478,8 @@ int main(int argCount, char** argv)
     }
 
     /* No input filename ==> use stdin and stdout */
-    filenameIdx += !filenameIdx;   /*< default input is stdin */
-    if (!strcmp(filenameTable[0], stdinmark) && !outFileName) outFileName = stdoutmark;   /*< when input is stdin, default output is stdout */
+    filenameIdx += !filenameIdx;   /* filenameTable[0] is stdin by default */
+    if (!strcmp(filenameTable[0], stdinmark) && !outFileName) outFileName = stdoutmark;   /* when input is stdin, default output is stdout */
 
     /* Check if input/output defined as console; trigger an error in this case */
     if (!strcmp(filenameTable[0], stdinmark) && IS_CONSOLE(stdin) ) CLEAN_RETURN(badusage(programName));