--- a/src/os_amiga.c
+++ b/src/os_amiga.c
@@ -234,13 +234,13 @@ mch_delay(long msec, int flags)
     void	    Delay(long);
 #endif
 
-    if (msec > 0)
-    {
-	if (flags & MCH_DELAY_IGNOREINPUT)
-	    Delay(msec / 20L);	    // Delay works with 20 msec intervals
-	else
-	    WaitForChar(raw_in, msec * 1000L);
-    }
+    if (msec <= 0)
+	return;
+
+    if (flags & MCH_DELAY_IGNOREINPUT)
+	Delay(msec / 20L);	    // Delay works with 20 msec intervals
+    else
+	WaitForChar(raw_in, msec * 1000L);
 }
 
 /*
@@ -577,18 +577,18 @@ fname_case(
     size_t		    flen;
 
     fib = get_fib(name);
-    if (fib != NULL)
-    {
-	flen = STRLEN(name);
-	// TODO: Check if this fix applies to AmigaOS < 4 too.
+    if (fib == NULL)
+	return;
+
+    flen = STRLEN(name);
+    // TODO: Check if this fix applies to AmigaOS < 4 too.
 #ifdef __amigaos4__
-	if (fib->fib_DirEntryType == ST_ROOT)
-	    strcat(fib->fib_FileName, ":");
+    if (fib->fib_DirEntryType == ST_ROOT)
+	strcat(fib->fib_FileName, ":");
 #endif
-	if (flen == strlen(fib->fib_FileName))	// safety check
-	    mch_memmove(name, fib->fib_FileName, flen);
-	free_fib(fib);
-    }
+    if (flen == strlen(fib->fib_FileName))	// safety check
+	mch_memmove(name, fib->fib_FileName, flen);
+    free_fib(fib);
 }
 
 /*
@@ -609,17 +609,17 @@ get_fib(char_u *fname)
 #else
     fib = ALLOC_ONE(struct FileInfoBlock);
 #endif
-    if (fib != NULL)
+    if (fib == NULL)
+	return;
+
+    flock = Lock((UBYTE *)fname, (long)ACCESS_READ);
+    if (flock == (BPTR)NULL || !Examine(flock, fib))
     {
-	flock = Lock((UBYTE *)fname, (long)ACCESS_READ);
-	if (flock == (BPTR)NULL || !Examine(flock, fib))
-	{
-	    free_fib(fib);  // in case of an error the memory is freed here
-	    fib = NULL;
-	}
-	if (flock)
-	    UnLock(flock);
+	free_fib(fib);  // in case of an error the memory is freed here
+	fib = NULL;
     }
+    if (flock)
+	UnLock(flock);
     return fib;
 }
 
@@ -815,11 +815,11 @@ mch_getperm(char_u *name)
     long		    retval = -1;
 
     fib = get_fib(name);
-    if (fib != NULL)
-    {
-	retval = fib->fib_Protection;
-	free_fib(fib);
-    }
+    if (fib == NULL)
+	return -1;
+
+    retval = fib->fib_Protection;
+    free_fib(fib);
     return retval;
 }
 
@@ -856,15 +856,15 @@ mch_isdir(char_u *name)
     int			    retval = FALSE;
 
     fib = get_fib(name);
-    if (fib != NULL)
-    {
+    if (fib == NULL)
+	return FALSE;
+
 #ifdef __amigaos4__
-	retval = (FIB_IS_DRAWER(fib)) ? TRUE : FALSE;
+    retval = (FIB_IS_DRAWER(fib)) ? TRUE : FALSE;
 #else
-	retval = ((fib->fib_DirEntryType >= 0) ? TRUE : FALSE);
+    retval = ((fib->fib_DirEntryType >= 0) ? TRUE : FALSE);
 #endif
-	free_fib(fib);
-    }
+    free_fib(fib);
     return retval;
 }
 
@@ -877,12 +877,11 @@ mch_mkdir(char_u *name)
     BPTR	lock;
 
     lock = CreateDir(name);
-    if (lock != NULL)
-    {
-	UnLock(lock);
-	return 0;
-    }
-    return -1;
+    if (lock == NULL)
+	return -1;
+
+    UnLock(lock);
+    return 0;
 }
 
 /*
@@ -1173,17 +1172,17 @@ out:
     void
 mch_set_shellsize(void)
 {
-    if (term_console)
-    {
-	size_set = TRUE;
-	out_char(CSI);
-	out_num((long)Rows);
-	out_char('t');
-	out_char(CSI);
-	out_num((long)Columns);
-	out_char('u');
-	out_flush();
-    }
+    if (!term_console)
+	return;
+
+    size_set = TRUE;
+    out_char(CSI);
+    out_num((long)Rows);
+    out_char('t');
+    out_char(CSI);
+    out_num((long)Columns);
+    out_char('u');
+    out_flush();
 }
 
 /*