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libc: Don't trash errno in malloc()

The errno value must be set as near of the error as it happens.
Modyfing the value of errno in a place where the error is not
generated drives to incorrect diagnosis messages.

--- a/src/libc/stdlib/malloc.c

+++ b/src/libc/stdlib/malloc.c

@@ -1,4 +1,3 @@

-#include <errno.h>

 #include <stdint.h>

 #include <stdlib.h>

 #include <string.h>

@@ -153,10 +152,8 @@

 		}

 		if (cur == freep) {

-			if ((cur = morecore(nunits)) == NULL) {

-				errno = ENOMEM;

+			if ((cur = morecore(nunits)) == NULL)

 				return NULL;

-			}

 		}

 	}

 }