x86/boot: Remove unused function atou()

I can't find any sign of atou() having been used. Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240913005753.1392431-1-linux@treblig.org

Author: Dr. David Alan Gilbert

arch/x86/boot/boot.h

@@ -305,7 +305,6 @@ void initregs(struct biosregs *regs);
 int strcmp(const char *str1, const char *str2);
 int strncmp(const char *cs, const char *ct, size_t count);
 size_t strnlen(const char *s, size_t maxlen);
-unsigned int atou(const char *s);
 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
 size_t strlen(const char *s);
 char *strchr(const char *s, int c);

arch/x86/boot/string.c

@@ -88,14 +88,6 @@ size_t strnlen(const char *s, size_t maxlen)
 	return (es - s);
 }
 
-unsigned int atou(const char *s)
-{
-	unsigned int i = 0;
-	while (isdigit(*s))
-		i = i * 10 + (*s++ - '0');
-	return i;
-}
-
 /* Works only for digits and letters, but small and fast */
 #define TOLOWER(x) ((x) | 0x20)
 

arch/x86/boot/string.h

@@ -24,7 +24,6 @@ extern size_t strlen(const char *s);
 extern char *strstr(const char *s1, const char *s2);
 extern char *strchr(const char *s, int c);
 extern size_t strnlen(const char *s, size_t maxlen);
-extern unsigned int atou(const char *s);
 extern unsigned long long simple_strtoull(const char *cp, char **endp,
 					  unsigned int base);
 long simple_strtol(const char *cp, char **endp, unsigned int base);