Reduce indentation level by early returning or continuing loop

Replace code like this

```c
func() {
    if (cond) {
	...
	...
	...
    }
    return ret;
}
```

```c
for (...) {
    if (cond) {
	...
	...
	...
    }
}
```

with

```c
func() {
    if (!cond) {
	return ret;
    }
    ...
    ...
    ...
}
```

```c
for (...) {
    if (!cond) {
	continue;
    }
    ...
    ...
    ...
}
```

1 files changed, 16 insertions, 15 deletions

diff --git a/src/nvim/ex_docmd.c b/src/nvim/ex_docmd.c
index 2d20ec5025..56c8206d2a 100644
--- a/src/nvim/ex_docmd.c
+++ b/src/nvim/ex_docmd.c
@@ -7748,24 +7748,25 @@ static char_u *arg_all(void)
     len = 0;
     for (idx = 0; idx < ARGCOUNT; ++idx) {
       p = alist_name(&ARGLIST[idx]);
-      if (p != NULL) {
-        if (len > 0) {
-          /* insert a space in between names */
-          if (retval != NULL)
-            retval[len] = ' ';
-          ++len;
-        }
-        for (; *p != NUL; ++p) {
-          if (*p == ' ' || *p == '\\') {
-            /* insert a backslash */
-            if (retval != NULL)
-              retval[len] = '\\';
-            ++len;
-          }
+      if (p == NULL) {
+        continue;
+      }
+      if (len > 0) {
+        /* insert a space in between names */
+        if (retval != NULL)
+          retval[len] = ' ';
+        ++len;
+      }
+      for (; *p != NUL; ++p) {
+        if (*p == ' ' || *p == '\\') {
+          /* insert a backslash */
           if (retval != NULL)
-            retval[len] = *p;
+            retval[len] = '\\';
           ++len;
         }
+        if (retval != NULL)
+          retval[len] = *p;
+        ++len;
       }
     }