first stage: Remove/dedent else block

Since the above if block ends in a call to os.execv() this block will
only ever run when the if condition was false. Hence putting it in an
else clause is unnecessary.

mitogen/master.py

@@ -714,7 +714,6 @@ class Stream(mitogen.core.Stream):
             for f in R,r,W,w:os.close(f)
             os.environ['ARGV0']=e=sys.executable
             os.execv(e,['mitogen:CONTEXT_NAME'])
-        else:
         os.write(1,'EC0\n')
         C=zlib.decompress(sys.stdin.read(input()))
         os.fdopen(W,'w',0).write(C)