Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/alpha/lib/fls.c b/arch/alpha/lib/fls.c
index 32afaa3..ddd048c 100644
--- a/arch/alpha/lib/fls.c
+++ b/arch/alpha/lib/fls.c
@@ -6,7 +6,7 @@
 #include <linux/bitops.h>
 
 /* This is fls(x)-1, except zero is held to zero.  This allows most
-   efficent input into extbl, plus it allows easy handling of fls(0)=0.  */
+   efficient input into extbl, plus it allows easy handling of fls(0)=0.  */
 
 const unsigned char __flsm1_tab[256] = 
 {