Properly use the envp argument in execvPe().

execvPe() is called by _execvpe(), which we added to implement
posix_spawnp(). We just took execvP() and added the envp argument.
Unfortunately we forgot to change the implementation to use envp over
environ.

This fixes the following piece of code:

| char * const arg[2] = { "env", NULL };
| char * const env[2] = { "FOO=BAR", NULL };
| posix_spawnp(NULL, "/usr/bin/env", NULL, NULL, arg, env);

MFC after:	2 weeks

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/libc/gen/exec.c b/lib/libc/gen/exec.c
index 985a09a..7ffce90 100644
--- a/lib/libc/gen/exec.c
+++ b/lib/libc/gen/exec.c
@@ -209,7 +209,7 @@ execvPe(name, path, argv, envp)
 		bcopy(name, buf + lp + 1, ln);
 		buf[lp + ln + 1] = '\0';
 
-retry:		(void)_execve(bp, argv, environ);
+retry:		(void)_execve(bp, argv, envp);
 		switch (errno) {
 		case E2BIG:
 			goto done;
@@ -228,7 +228,7 @@ retry:		(void)_execve(bp, argv, environ);
 			memp[0] = "sh";
 			memp[1] = bp;
 			bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
-			(void)_execve(_PATH_BSHELL, memp, environ);
+			(void)_execve(_PATH_BSHELL, memp, envp);
 			goto done;
 		case ENOMEM:
 			goto done;