inpcom.c, inp_remove_ws(), avoid appending a surplus '\0'

src/frontend/inpcom.c

@@ -2199,7 +2199,7 @@ static char*
 inp_remove_ws(char *s)
 {
     char *x = s;
-    char *big_buff = TMALLOC(char, strlen(s) + 2);
+    char *big_buff = TMALLOC(char, strlen(s) + 1);
     char *d = big_buff;
     char *buffer;
     bool is_expression = FALSE;
@@ -2214,6 +2214,9 @@ inp_remove_ws(char *s)
         if (*s == '=' || (is_expression && (is_arith_char(*s) || *s == ','))) {
             s = skip_ws(s + 1);
 
+            if (*s == '\0')
+                continue;
+
             if (*s == '{')
                 is_expression = TRUE;
             if (*s == '}')