Remove check for za == NULL (which would segfault while setting the error). --HG-- branch : HEAD

diff --git a/lib/zip_source_crc.c b/lib/zip_source_crc.c
index 7ffbfea..59e8a19 100644
--- a/lib/zip_source_crc.c
+++ b/lib/zip_source_crc.c

@@ -56,7 +56,7 @@
 {
     struct crc *ctx;
 
-    if (za == NULL || src == NULL) {
+    if (src == NULL) {
 	_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
 	return NULL;
     }

diff --git a/lib/zip_source_deflate.c b/lib/zip_source_deflate.c
index 0da1940..ca3db41 100644
--- a/lib/zip_source_deflate.c
+++ b/lib/zip_source_deflate.c

@@ -67,7 +67,7 @@
     struct deflate *ctx;
     struct zip_source *s2;
 
-    if (za == NULL || src == NULL || cm != ZIP_CM_DEFLATE) {
+    if (src == NULL || cm != ZIP_CM_DEFLATE) {
 	_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
 	return NULL;
     }

diff --git a/lib/zip_source_pkware.c b/lib/zip_source_pkware.c
index c7736a9..c1f3e42 100644
--- a/lib/zip_source_pkware.c
+++ b/lib/zip_source_pkware.c

@@ -71,8 +71,7 @@
     struct trad_pkware *ctx;
     struct zip_source *s2;
 
-    if (za == NULL || password == NULL || src == NULL
-	|| em != ZIP_EM_TRAD_PKWARE) {
+    if (password == NULL || src == NULL || em != ZIP_EM_TRAD_PKWARE) {
 	_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
 	return NULL;
     }