patch 9.0.1245: code is indented more than necessary

Problem:    Code is indented more than necessary.
Solution:   Use an early return where it makes sense. (Yegappan Lakshmanan,
            closes #11879)
diff --git a/src/testing.c b/src/testing.c
index 039ee0c..b31d192 100644
--- a/src/testing.c
+++ b/src/testing.c
@@ -55,8 +55,10 @@
 	mch_memmove(buf, p, clen);
 	buf[clen] = NUL;
 	ga_concat(gap, buf);
+	return;
     }
-    else switch (*p)
+
+    switch (*p)
     {
 	case BS: ga_concat(gap, (char_u *)"\\b"); break;
 	case ESC: ga_concat(gap, (char_u *)"\\e"); break;