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rc: remove silly efree check

--- a/sys/src/cmd/rc/havefork.c

+++ b/sys/src/cmd/rc/havefork.c

@@ -129,8 +129,7 @@

 			*s='\0';

 			v = newword(wd, v);

 		}

-		if(wd)

-			efree(wd);

+		free(wd);

 		closeio(f);

 		Waitfor(pid, 0);

 		/* v points to reversed arglist -- reverse it onto argv */

@@ -230,4 +229,4 @@

 	}

 	addwaitpid(pid);

 	return pid;

-}

\ No newline at end of file

+}

--- a/sys/src/cmd/rc/haventfork.c

+++ b/sys/src/cmd/rc/haventfork.c

@@ -108,8 +108,7 @@

 		*s='\0';

 		v=newword(wd, v);

 	}

-	if(wd)

-		efree(wd);

+	free(wd);

 	closeio(f);

 	Waitfor(pid, 1);

 	/* v points to reversed arglist -- reverse it onto argv */