Replace dead OMAP_MUX_ERRORS with OMAP_MUX_WARNINGS

OMAP_MUX_ERRORS doesn't exist in Kconfig, therefore replacing all
references for it with OMAP_MUX_WARNINGS in the source code.

Signed-off-by: Christoph Egger <siccegge@cs.fau.de>
Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap1/mux.c b/arch/arm/mach-omap1/mux.c
index 8434137..3e98835 100644
--- a/arch/arm/mach-omap1/mux.c
+++ b/arch/arm/mach-omap1/mux.c
@@ -440,7 +440,7 @@
 	}
 #endif
 
-#ifdef CONFIG_OMAP_MUX_ERRORS
+#ifdef CONFIG_OMAP_MUX_WARNINGS
 	return warn ? -ETXTBSY : 0;
 #else
 	return 0;