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textscreen: Check return value from realloc().

This fixes a static analysis warning detected in #939. Thanks to
@turol for finding this.

--- a/textscreen/txt_fileselect.c

+++ b/textscreen/txt_fileselect.c

@@ -101,7 +101,12 @@

         }

         else

         {

-            result = realloc(result, result_len + bytes + 1);

+            char *new_result = realloc(result, result_len + bytes + 1);

+            if (new_result == NULL)

+            {

+                break;

+            }

+            result = new_result;

             memcpy(result + result_len, buf, bytes);

             result_len += bytes;

             result[result_len] = '\0';