gunzip: rename z{alloc, free} to gz{alloc, free}

This allows us to add a proper zalloc() func (one that does a zeroing
alloc), and removes duplicate prototypes.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/lib/gunzip.c b/lib/gunzip.c
index 8b16b24..99a8ab0 100644
--- a/lib/gunzip.c
+++ b/lib/gunzip.c
@@ -36,10 +36,7 @@
 #define RESERVED		0xe0
 #define DEFLATED		8
 
-void *zalloc(void *, unsigned, unsigned);
-void zfree(void *, void *, unsigned);
-
-void *zalloc(void *x, unsigned items, unsigned size)
+void *gzalloc(void *x, unsigned items, unsigned size)
 {
 	void *p;
 
@@ -51,7 +48,7 @@
 	return (p);
 }
 
-void zfree(void *x, void *addr, unsigned nb)
+void gzfree(void *x, void *addr, unsigned nb)
 {
 	free (addr);
 }
@@ -94,8 +91,8 @@
 	z_stream s;
 	int r;
 
-	s.zalloc = zalloc;
-	s.zfree = zfree;
+	s.zalloc = gzalloc;
+	s.zfree = gzfree;
 
 	r = inflateInit2(&s, -MAX_WBITS);
 	if (r != Z_OK) {