spelling: s/retreive/retrieve/

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 977ee3a..34ab0da 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -972,7 +972,7 @@
 #endif
 
 #ifdef CONFIG_PPC_RTAS
-	/* To help early debugging via the front panel, we retreive a minimal
+	/* To help early debugging via the front panel, we retrieve a minimal
 	 * set of RTAS infos now if available
 	 */
 	{