more buffer overflow avoiding through using snprintf()

src/pair_table.cpp

@@ -362,7 +362,7 @@ void PairTable::read_table(Table *tb, char *file, char *keyword)
   FILE *fp = force->open_potential(file);
   if (fp == NULL) {
     char str[128];
-    sprintf(str,"Cannot open file %s",file);
+    snprintf(str,128,"Cannot open file %s",file);
     error->one(FLERR,str);
   }