patch 8.2.2457: Coverity warns for memory leak

Problem:    Coverity warns for memory leak.
Solution:   Free memory when out of memory.
diff --git a/src/if_cscope.c b/src/if_cscope.c
index bbb429a..f52316f 100644
--- a/src/if_cscope.c
+++ b/src/if_cscope.c
@@ -1813,7 +1813,10 @@
 
 	   context = alloc(strlen(cntx)+5);
 	   if (context == NULL)
+	   {
+	       vim_free(fullname);
 	       continue;
+	   }
 
 	   if (strcmp(cntx, "<global>")==0)
 	       strcpy(context, "<<global>>");
diff --git a/src/version.c b/src/version.c
index 804899f..ab00e37 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2457,
+/**/
     2456,
 /**/
     2455,