patch 8.0.1825: might use NULL pointer when out of memory

Problem:    Might use NULL pointer when out of memory. (Coverity)
Solution:   Handle NULL pointer better.
diff --git a/src/getchar.c b/src/getchar.c
index 5b5b3ed..e82155f 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -4523,10 +4523,12 @@
 
 	    if (vim_strbyte(mp->m_keys, K_SPECIAL) != NULL)
 	    {
+		char_u *qe = vim_strsave(mp->m_keys);
+
 		/* might have CSI escaped mp->m_keys */
-		q = vim_strsave(mp->m_keys);
-		if (q != NULL)
+		if (qe != NULL)
 		{
+		    q = qe;
 		    vim_unescape_csi(q);
 		    qlen = (int)STRLEN(q);
 		}
diff --git a/src/version.c b/src/version.c
index 12a8073..9743283 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1825,
+/**/
     1824,
 /**/
     1823,