Rename e{malloc,realloc,free} to u{malloc,realloc,free}, to more obviously

reflect the fact that they allocate and deallocate user memory (i.e.
things reached through a userptr_t).

src/usr/fetch.c

@@ -25,7 +25,7 @@
 
 #include <errno.h>
 #include <vsprintf.h>
-#include <gpxe/emalloc.h>
+#include <gpxe/umalloc.h>
 #include <gpxe/ebuffer.h>
 #include <gpxe/image.h>
 #include <gpxe/uri.h>
@@ -45,9 +45,9 @@
  * @ret len		Length of loaded file
  * @ret rc		Return status code
  *
- * Fetch file to an external buffer allocated with emalloc().  The
+ * Fetch file to an external buffer allocated with umalloc().  The
  * caller is responsible for eventually freeing the buffer with
- * efree().
+ * ufree().
  */
 int fetch ( const char *uri_string, userptr_t *data, size_t *len ) {
 	struct uri *uri;
@@ -101,7 +101,7 @@ int fetch ( const char *uri_string, userptr_t *data, size_t *len ) {
 	return 0;
 
  err:
-	efree ( buffer.addr );
+	ufree ( buffer.addr );
  err_ebuffer_alloc:
 	free_uri ( uri );
  err_parse_uri:

src/usr/imgmgmt.c

@@ -21,7 +21,7 @@
 #include <errno.h>
 #include <vsprintf.h>
 #include <gpxe/image.h>
-#include <gpxe/emalloc.h>
+#include <gpxe/umalloc.h>
 #include <usr/fetch.h>
 #include <usr/imgmgmt.h>
 
@@ -66,7 +66,7 @@ int imgfetch ( const char *filename, const char *name,
 	return 0;
 
  err:
-	efree ( image->data );
+	ufree ( image->data );
 	free ( image );
 	return rc;
 }
@@ -139,6 +139,6 @@ void imgstat ( struct image *image ) {
  */
 void imgfree ( struct image *image ) {
 	unregister_image ( image );
-	efree ( image->data );
+	ufree ( image->data );
 	free ( image );
 }