patch 8.2.2457: Coverity warns for memory leak

Problem:    Coverity warns for memory leak.
Solution:   Free memory when out of memory.

Author: brammool

src/if_cscope.c

@@ -1813,7 +1813,10 @@ cs_file_results(FILE *f, int *nummatches_a)
 
 	   context = alloc(strlen(cntx)+5);
 	   if (context == NULL)
+	   {
+	       vim_free(fullname);
 	       continue;
+	   }
 
 	   if (strcmp(cntx, "<global>")==0)
 	       strcpy(context, "<<global>>");

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2457,
 /**/
     2456,
 /**/