fix CID #1169705 (dereference before null check)

Signed-off-by: NNoel Power <noel.power@suse.com>

src/iniparser.c

@@ -63,11 +63,11 @@ static void strlwc(char * s)
 /*--------------------------------------------------------------------------*/
 void strstrip(char * s)
 {
+    if (s==NULL) return ;
+
     char *last = s + strlen(s);
     char *dest = s;
     
-    if (s==NULL) return ;
-    
     while (isspace((int)*s) && *s) s++;
     while (last > s) {
         if (!isspace((int)*(last-1)))