email: Fixed segfault introduced in commit 195b63f99c

lib/imap.c

@@ -2314,7 +2314,7 @@ static CURLcode imap_parse_url_options(struct connectdata *conn)
   const char *ptr = options;
   bool reset = TRUE;
 
-  while(*ptr) {
+  while(ptr && *ptr) {
     const char *key = ptr;
 
     while(*ptr && *ptr != '=')

lib/pop3.c

@@ -1834,7 +1834,7 @@ static CURLcode pop3_parse_url_options(struct connectdata *conn)
   const char *ptr = options;
   bool reset = TRUE;
 
-  while(*ptr) {
+  while(ptr && *ptr) {
     const char *key = ptr;
 
     while(*ptr && *ptr != '=')

lib/smtp.c

@@ -1929,7 +1929,7 @@ static CURLcode smtp_parse_url_options(struct connectdata *conn)
   const char *ptr = options;
   bool reset = TRUE;
 
-  while(*ptr) {
+  while(ptr && *ptr) {
     const char *key = ptr;
 
     while(*ptr && *ptr != '=')