patch 9.0.1132: code is indented more than needed

Problem:    Code is indented more than needed.
Solution:   Use an early return to reduce indentation. (Yegappan Lakshmanan,
            closes #11769)
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 9a507c9..4755952 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -7049,12 +7049,12 @@
 	}
     }
 
-    if (fname != NULL)
-    {
-	eap->arg = fname;
-	do_exedit(eap, NULL);
-	vim_free(fname);
-    }
+    if (fname == NULL)
+	return;
+
+    eap->arg = fname;
+    do_exedit(eap, NULL);
+    vim_free(fname);
 }
 
 /*