MFC r315360:

Return NULL instead of 0 on failure in _kvm_open, kvm_open{,2,files}

This is being done for the following reasons:
- kvm_open(3), etc says they will return NULL.
- NULL by definition is (void*)0 per POSIX, but can be redefined,
  depending on the compiler, etc.

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/libkvm/kvm.c b/lib/libkvm/kvm.c
index c8c34f2..0de0dd6 100644
--- a/lib/libkvm/kvm.c
+++ b/lib/libkvm/kvm.c
@@ -479,7 +479,7 @@ failed:
 	if (errout != NULL)
 		strlcpy(errout, kd->errbuf, _POSIX2_LINE_MAX);
 	(void)kvm_close(kd);
-	return (0);
+	return (NULL);
 }
 
 kvm_t *
@@ -492,7 +492,7 @@ kvm_openfiles(const char *uf, const char *mf, const char *sf __unused, int flag,
 		if (errout != NULL)
 			(void)strlcpy(errout, strerror(errno),
 			    _POSIX2_LINE_MAX);
-		return (0);
+		return (NULL);
 	}
 	return (_kvm_open(kd, uf, mf, flag, errout));
 }
@@ -507,7 +507,7 @@ kvm_open(const char *uf, const char *mf, const char *sf __unused, int flag,
 		if (errstr != NULL)
 			(void)fprintf(stderr, "%s: %s\n",
 				      errstr, strerror(errno));
-		return (0);
+		return (NULL);
 	}
 	kd->program = errstr;
 	return (_kvm_open(kd, uf, mf, flag, NULL));
@@ -523,7 +523,7 @@ kvm_open2(const char *uf, const char *mf, int flag, char *errout,
 		if (errout != NULL)
 			(void)strlcpy(errout, strerror(errno),
 			    _POSIX2_LINE_MAX);
-		return (0);
+		return (NULL);
 	}
 	kd->resolve_symbol = resolver;
 	return (_kvm_open(kd, uf, mf, flag, errout));