edje_entry: avoid memory leak on error path

In commit 8cb0b193ea the logic was changed and we could return here
without free'ing the plain_text resource we allocated. Make sure we
handle this even on the error case and early return.

CID: 1408481

Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Differential Revision: https://phab.enlightenment.org/D11433

src/lib/edje/edje_entry.c

@@ -4739,7 +4739,11 @@ _edje_entry_imf_retrieve_surrounding_cb(void *data, Ecore_IMF_Context *ctx EINA_
                        char *itr = NULL;
                        size_t len = eina_unicode_utf8_get_len(plain_text);
                        char *u_text = (char *)malloc(len * sizeof(char) + 1);
-                       if (!u_text) return EINA_FALSE;
+                       if (!u_text)
+                         {
+                            free(plain_text);
+                            return EINA_FALSE;
+                         }
 
                        itr = u_text;
                        while (eina_unicode_utf8_next_get(plain_text, &idx))